Official source article: GitHub GHSA-Q39V-W2G7-GR8J ↗. Check the applicable product and release in the original source.
9.2CriticalCVSS 4.0
Recommended action
Within 72 hours
Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.
Published severityCritical→Operational priority:Critical, unchanged from published severity.unchanged
Evidence used
No CISA KEV confirmation is currently recorded.
A structured source references public exploit or proof-of-concept material.
The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
EPSS is 0.78% for the current model date.
Compensating controls
Validate the affected product branch and deploy the verified fixed release.
Restrict the affected network interface to trusted sources where business-safe.
Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
Confirm that the asset runs libevent libevent and falls inside the recorded affected range.
Verify the installed build against the product-specific fixed version after deployment.
Validate exposure, authentication requirements and compensating controls in the actual environment.
Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
Release-specific package status
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
5 package states
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
Distribution release
Source package
Vendor state
Fixed version
Evidence
Debian trixietrixie · source
libevent
Vendor fix publishedDebian records a fixed source-package version for this release.
Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
The vendor explicitly identifies these products as affected by this CVE.
libevent-devel as a component of Red Hat Enterprise Linux 6
libevent-doc as a component of Red Hat Enterprise Linux 6
libevent-headers as a component of Red Hat Enterprise Linux 6
libevent.src as a component of Red Hat Enterprise Linux 6
libevent2-devel as a component of Red Hat Enterprise Linux 6
libevent2-doc as a component of Red Hat Enterprise Linux 6
libevent2.src as a component of Red Hat Enterprise Linux 6
libevent-devel as a component of Red Hat Enterprise Linux 7
libevent-doc as a component of Red Hat Enterprise Linux 7
libevent.src as a component of Red Hat Enterprise Linux 7
openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4
openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
Summary
A flaw was found in libevent. The evhttp parser in libevent's http.c component inconsistently handles HTTP Transfer-Encoding headers and chunked framing. This inconsistency allows an unauthenticated remote attacker to desynchronize request boundaries when libevent is used behind a proxy. Successful exploitation could lead to request smuggling, potentially bypassing access controls or poisoning caches.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.
Official European source
ENISA European Vulnerability Database
Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.
1 current
ENISA EUVD identifier
EUVD-2026-63505
No EUVD known-exploited evidence
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.2 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours
Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.
Patch available
01
What, why and how
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
What
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Why
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Why
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No confirmed evidence
No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.Reference recorded
CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.
Likely attack path
a network path → Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness ?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'). The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
CVSS vector ?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCLowSubsequent-system confidentiality: A successful attack can cause a limited loss.SILowSubsequent-system integrity: A successful attack can cause a limited loss.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2026-63505Official EUVD mapping
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Official EUVD record ↗BSI · German · WID-SEC-2026-3419Red Hat Enterprise Linux (corosync, libevent, libsoup): Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen oder Denial-of-Service-Zustände herbeizuführen.
Official advisory ↗Cyber Security Agency of Singapore · English · CSA-SB-20260826Security Bulletin 26 Aug 2026
The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 26 Aug 2026, published on 26 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.
Official advisory ↗CERT-FR · French · CERTFR-2026-AVI-1249Multiples vulnérabilités dans les produits VMware
Operational remediation based on structured source evidence.
Status ?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 20 Aug 2026 · Last source change 20 Aug 2026, 19:33 UTC · CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source ?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.FIRST · tracked since 2026-08-23
European sourceENISA EUVD · EUVD-2026-63505
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Affected versionsThe structured affected or fixed version information changed.
Before
libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-debuginfo-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-doc-0:2.1.13-1.el10_2.noarch as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.13-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); libevent-debuginfo-0:2.1.13-1.el9_8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); and 69 more
After
libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-debuginfo-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-doc-0:2.1.13-1.el10_2.noarch as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.13-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); libevent-debuginfo-0:2.1.13-1.el9_8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); and 97 more
Affected versionsThe structured affected or fixed version information changed.
Before
libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-debuginfo-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-doc-0:2.1.13-1.el10_2.noarch as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.13-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); libevent-debuginfo-0:2.1.13-1.el9_8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); and 64 more
After
libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-debuginfo-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-doc-0:2.1.13-1.el10_2.noarch as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.13-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); libevent-debuginfo-0:2.1.13-1.el9_8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); and 69 more
Affected versionsThe structured affected or fixed version information changed.
Before
>= 2.2.0-alpha, < 2.2.2-alpha; < 2.1.13 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
>= 2.2.0-alpha, < 2.2.2-alpha; < 2.1.13 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Affected versionsThe structured affected or fixed version information changed.
Before
libevent-devel as a component of Red Hat Enterprise Linux 10; libevent-doc as a component of Red Hat Enterprise Linux 10; libevent.src as a component of Red Hat Enterprise Linux 10; libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; libevent-devel as a component of Red Hat Enterprise Linux 8; libevent-doc as a component of Red Hat Enterprise Linux 8; libevent.src as a component of Red Hat Enterprise Linux 8; libevent-devel as a component of Red Hat Enterprise Linux 9; libevent-doc as a component of Red Hat Enterprise Linux 9; libevent.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-main@aarch64 as a component of Red Hat Hardened Images; libevent-main@noarch as a component of Red Hat Hardened Images; libevent-main@src as a component of Red Hat Hardened Images; libevent-main@x86_64 as a component of Red Hat Hardened Images
After
libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-debuginfo-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debugsource-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-devel-0:2.1.13-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-doc-0:2.1.13-1.el10_2.noarch as a component of Red Hat Enterprise Linux AppStream (v. 10); libevent-debuginfo-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debugsource-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-devel-0:2.1.8-11.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libevent-debuginfo-0:2.1.13-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); libevent-debuginfo-0:2.1.13-1.el9_8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); and 64 more
Affected versionsThe structured affected or fixed version information changed.
Before
libevent-devel as a component of Red Hat Enterprise Linux 10; libevent-doc as a component of Red Hat Enterprise Linux 10; libevent.src as a component of Red Hat Enterprise Linux 10; libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; libevent-devel as a component of Red Hat Enterprise Linux 8; libevent-doc as a component of Red Hat Enterprise Linux 8; libevent.src as a component of Red Hat Enterprise Linux 8; libevent-devel as a component of Red Hat Enterprise Linux 9; libevent-doc as a component of Red Hat Enterprise Linux 9; libevent.src as a component of Red Hat Enterprise Linux 9; libevent.src as a component of Red Hat Hardened Images; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4
After
libevent-devel as a component of Red Hat Enterprise Linux 10; libevent-doc as a component of Red Hat Enterprise Linux 10; libevent.src as a component of Red Hat Enterprise Linux 10; libevent-devel as a component of Red Hat Enterprise Linux 6; libevent-doc as a component of Red Hat Enterprise Linux 6; libevent-headers as a component of Red Hat Enterprise Linux 6; libevent.src as a component of Red Hat Enterprise Linux 6; libevent2-devel as a component of Red Hat Enterprise Linux 6; libevent2-doc as a component of Red Hat Enterprise Linux 6; libevent2.src as a component of Red Hat Enterprise Linux 6; libevent-devel as a component of Red Hat Enterprise Linux 7; libevent-doc as a component of Red Hat Enterprise Linux 7; libevent.src as a component of Red Hat Enterprise Linux 7; libevent-devel as a component of Red Hat Enterprise Linux 8; libevent-doc as a component of Red Hat Enterprise Linux 8; libevent.src as a component of Red Hat Enterprise Linux 8; libevent-devel as a component of Red Hat Enterprise Linux 9; libevent-doc as a component of Red Hat Enterprise Linux 9; libevent.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: libevent-main@aarch64 as a component of Red Hat Hardened Images; libevent-main@noarch as a component of Red Hat Hardened Images; libevent-main@src as a component of Red Hat Hardened Images; libevent-main@x86_64 as a component of Red Hat Hardened Images
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
BlackTreeCVE Intelligence