BlackTreeIndependent security intelligence

Full vulnerability report · 2026

CVE-2026-4111High confidence

Libarchive: infinite loop denial of service in rar5 decompression via archive_read_data() in libarchive

Red Hat · Red Hat Enterprise Linux 10

7.5HighCVSS 3.1

Recommended action

Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state

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.

Ubuntu release	Source package	Vendor state	Fixed version	Evidence
Ubuntu 24.04 LTSnoble · standard archive	`libarchive`	Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.	`3.7.2-2ubuntu0.6`	Canonical record ↗Source updated 8 Sept 2026

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current

CVE-2026-4111 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitylibarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive

3 known affected

The vendor explicitly identifies these products as affected by this CVE.

libarchive as a component of Red Hat Enterprise Linux 6
libarchive-devel as a component of Red Hat Enterprise Linux 6
libarchive.src as a component of Red Hat Enterprise Linux 6

Summary: A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives.
Remediation: For OpenShift Container Platform 4.13 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.13/html/release_notes You may download the oc tool and use it to inspect release image metadata for x86_64 architecture. The image digest may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags. The sha value for the release is as follows: (For x86_64 architecture) The image digest is sha256:8f2d90675314d5860aa070a036e7b2ecc57ed56df6fddb229835cdb674364874 All OpenShift Container Platform 4.13 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.13/html-single/updating_clusters/index#updating-cluster-within-minor.

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-2026-12031

No EUVD known-exploited evidence

A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives.

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: 7.5 · CVSS 3.1
Advisory evidence: No linked advisory details stored yet

Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

What

Why

A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.

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

Why

A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.

How

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.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: a network path → Loop with Unreachable Exit Condition ('Infinite Loop') → 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: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-835 ↗
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop'). The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Common Vulnerability Scoring System 3.1: 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.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
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.

NetworkUnauthenticatedCWE-835

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-12031Official EUVD mapping

Official EUVD record

BSI · German · WID-SEC-W-2026-2437Oracle Communications: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory

BSI · German · WID-SEC-W-2026-0785libarchive: Schwachstelle ermöglicht Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in libarchive ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory

CERT-FR · French · CERTFR-2026-AVI-0958Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-40175 Référence CVE CVE-2026-40198 https://www.cve.org/CVERecord?id=CVE-2026-40198 Référence CVE CVE-2026-40199 https://www.cve.org/CVERecord?id=CVE-2026-40199 Référence CVE CVE-2026-40356 https://www.cve.org/CVERecord?id=CVE-2026-40356 Référence CVE CVE-2026-40895 https://www.cve.org/CVERecord?id=CVE-2026-40895 Référence CVE CVE-2026-40988 https://www.cve.org/CVERecord?id=CVE-2026-40988 Référence CVE CVE-2026-41006 https://www.cve.org/CVERecord?id=CVE-2026-41006 Référence CVE CVE-2026-41007 https://www.cve.org/CVERecord?id=CVE-2026-41007 Référence CVE CVE-2026-41035 https://www.cve.org/CVERecord?id=CVE-2026-41035 Référence CVE CVE-2026-4111 https://www.cve.org/CVERecord?id=CVE-2026-4111 Référence CVE CVE-2026-41409 https://www.cve.org/CVERecord?id=CVE-2026-41409 Référence CVE CVE-2026-41635 https://www.cve.org/CVERecord?id=CVE-2026-41635 Référence CVE CVE-2026-41694 https://www.cve.org/CVERecord?id=CVE-2026-41694 Référence CVE CVE-2026-41695 https://www.cve.org/CVERecord?id=CVE-2026-41695 Référence CVE CVE-2026-41711 https://www.cve.org/CVERecord?id=CVE-2026-41711 Référence CVE CVE-2026-41716 https://www.cve.org/CVERecord?id=CVE-2026-41716 Référence CVE CVE-2026-41721 https://www.cve.org/CVERecord?id=CVE-2026-41721 Référence CVE CVE-2026-41841 https://www.cve.org/CVERecord?id=C

Official advisory

CERT-FR · French · CERTFR-2026-AVI-0627Multiples vulnérabilités dans les produits Splunk

VERecord?id=CVE-2026-3543 Référence CVE CVE-2026-3544 https://www.cve.org/CVERecord?id=CVE-2026-3544 Référence CVE CVE-2026-3545 https://www.cve.org/CVERecord?id=CVE-2026-3545 Référence CVE CVE-2026-35469 https://www.cve.org/CVERecord?id=CVE-2026-35469 Référence CVE CVE-2026-3731 https://www.cve.org/CVERecord?id=CVE-2026-3731 Référence CVE CVE-2026-39892 https://www.cve.org/CVERecord?id=CVE-2026-39892 Référence CVE CVE-2026-40175 https://www.cve.org/CVERecord?id=CVE-2026-40175 Référence CVE CVE-2026-40192 https://www.cve.org/CVERecord?id=CVE-2026-40192 Référence CVE CVE-2026-40200 https://www.cve.org/CVERecord?id=CVE-2026-40200 Référence CVE CVE-2026-4111 https://www.cve.org/CVERecord?id=CVE-2026-4111 Référence CVE CVE-2026-41324 https://www.cve.org/CVERecord?id=CVE-2026-41324 Référence CVE CVE-2026-42308 https://www.cve.org/CVERecord?id=CVE-2026-42308 Référence CVE CVE-2026-42309 https://www.cve.org/CVERecord?id=CVE-2026-42309 Référence CVE CVE-2026-42310 https://www.cve.org/CVERecord?id=CVE-2026-42310 Référence CVE CVE-2026-42311 https://www.cve.org/CVERecord?id=CVE-2026-42311 Référence CVE CVE-2026-4424 https://www.cve.org/CVERecord?id=CVE-2026-4424 Référence CVE CVE-2026-5121 https://www.cve.org/CVERecord?id=CVE-2026-5121 Référence CVE CVE-2026-6042 https://www.cve.org/CVERecord?id=CVE-20

Official advisory

CERT-FR · French · CERTFR-2026-AVI-0556Multiples vulnérabilités dans les produits VMware

ord?id=CVE-2026-35238 Référence CVE CVE-2026-35239 https://www.cve.org/CVERecord?id=CVE-2026-35239 Référence CVE CVE-2026-35240 https://www.cve.org/CVERecord?id=CVE-2026-35240 Référence CVE CVE-2026-35469 https://www.cve.org/CVERecord?id=CVE-2026-35469 Référence CVE CVE-2026-3644 https://www.cve.org/CVERecord?id=CVE-2026-3644 Référence CVE CVE-2026-39883 https://www.cve.org/CVERecord?id=CVE-2026-39883 Référence CVE CVE-2026-39892 https://www.cve.org/CVERecord?id=CVE-2026-39892 Référence CVE CVE-2026-40192 https://www.cve.org/CVERecord?id=CVE-2026-40192 Référence CVE CVE-2026-41066 https://www.cve.org/CVERecord?id=CVE-2026-41066 Référence CVE CVE-2026-4111 https://www.cve.org/CVERecord?id=CVE-2026-4111 Référence CVE CVE-2026-4224 https://www.cve.org/CVERecord?id=CVE-2026-4224 Référence CVE CVE-2026-4424 https://www.cve.org/CVERecord?id=CVE-2026-4424 Référence CVE CVE-2026-4519 https://www.cve.org/CVERecord?id=CVE-2026-4519 Référence CVE CVE-2026-4539 https://www.cve.org/CVERecord?id=CVE-2026-4539 Référence CVE CVE-2026-4786 https://www.cve.org/CVERecord?id=CVE-2026-4786 Référence CVE CVE-2026-4878 https://www.cve.org/CVERecord?id=CVE-2026-4878 Référence CVE CVE-2026-5121 https://www.cve.org/CVERecord?id=CVE-2026-5121 Référence CVE CVE-2026-5598 https://www.cve.org/CVERecord?id=CVE-2026-5598 Ré

Official advisory

CERT-FR · French · CERTFR-2026-AVI-0394Multiples vulnérabilités dans VMware Tanzu

De multiples vulnérabilités ont été découvertes dans VMware Tanzu. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Official advisory

CERT-FR · French · CERTFR-2026-AVI-0321Multiples vulnérabilités dans les produits Microsoft

De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Official advisory

Patch and workaround

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.: Patch available
Affected: libarchive as a component of Red Hat Enterprise Linux 6; libarchive-devel as a component of Red Hat Enterprise Linux 6; libarchive.src as a component of Red Hat Enterprise Linux 6
Fixed: rhcos-x86_64-413.92.202604080111-0 as a component of Red Hat OpenShift Container Platform 4.13; rhcos-aarch64-414.92.202605060243-0 as a component of Red Hat OpenShift Container Platform 4.14; rhcos-ppc64le-414.92.202605060243-0 as a component of Red Hat OpenShift Container Platform 4.14; rhcos-s390x-414.92.202605060243-0 as a component of Red Hat OpenShift Container Platform 4.14; rhcos-x86_64-414.92.202605060243-0 as a component of Red Hat OpenShift Container Platform 4.14; rhcos-aarch64-415.92.202605060220-0 as a component of Red Hat OpenShift Container Platform 4.15; rhcos-ppc64le-415.92.202605060220-0 as a component of Red Hat OpenShift Container Platform 4.15; rhcos-s390x-415.92.202605060220-0 as a component of Red Hat OpenShift Container Platform 4.15; rhcos-x86_64-415.92.202605060220-0 as a component of Red Hat OpenShift Container Platform 4.15; rhcos-aarch64-416.94.202604211449-0 as a component of Red Hat OpenShift Container Platform 4.16; rhcos-ppc64le-416.94.202604211449-0 as a component of Red Hat OpenShift Container Platform 4.16; rhcos-s390x-416.94.202604211449-0 as a component of Red Hat OpenShift Container Platform 4.16; rhcos-x86_64-416.94.202604211449-0 as a component of Red Hat OpenShift Container Platform 4.16; rhcos-aarch64-417.94.202605112123-0 as a component of Red Hat OpenShift Container Platform 4.17; rhcos-ppc64le-417.94.202605112123-0 as a component of Red Hat OpenShift Container Platform 4.17; rhcos-s390x-417.94.202605112123-0 as a component of Red Hat OpenShift Container Platform 4.17; rhcos-x86_64-417.94.202605112123-0 as a component of Red Hat OpenShift Container Platform 4.17; rhcos-aarch64-418.94.202604140044-0 as a component of Red Hat OpenShift Container Platform 4.18; rhcos-ppc64le-418.94.202604140044-0 as a component of Red Hat OpenShift Container Platform 4.18; rhcos-s390x-418.94.202604140044-0 as a component of Red Hat OpenShift Container Platform 4.18; rhcos-x86_64-418.94.202604140044-0 as a component of Red Hat OpenShift Container Platform 4.18; rhcos-aarch64-4.19.9.6.202604211219-0 as a component of Red Hat OpenShift Container Platform 4.19; rhcos-ppc64le-4.19.9.6.202604211219-0 as a component of Red Hat OpenShift Container Platform 4.19; rhcos-s390x-4.19.9.6.202604211219-0 as a component of Red Hat OpenShift Container Platform 4.19; rhcos-x86_64-4.19.9.6.202604211219-0 as a component of Red Hat OpenShift Container Platform 4.19; bsdcat-debuginfo-0:3.7.7-5.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); bsdcat-debuginfo-0:3.7.7-5.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); bsdcat-debuginfo-0:3.7.7-5.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); bsdcat-debuginfo-0:3.7.7-5.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); bsdcpio-debuginfo-0:3.7.7-5.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); and 455 more
Action: For OpenShift Container Platform 4.13 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.13/html/release_notes You may download the oc tool and use it to inspect release image metadata for x86_64 architecture. The image digest may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags. The sha value for the release is as follows: (For x86_64 architecture) The image digest is sha256:8f2d90675314d5860aa070a036e7b2ecc57ed56df6fddb229835cdb674364874 All OpenShift Container Platform 4.13 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.13/html-single/updating_clusters/index#updating-cluster-within-minor.
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.

Evidence and provenance

Published 13 Mar 2026 · Last source change 1 Sept 2026, 12:04 UTC · CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

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 2026-08-14

European sourceENISA EUVD · EUVD-2026-12031

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.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

2026-03-13CVE published

2026-09-01Fixed release or patch reference recorded

ENISA EUVD · EUVD-2026-12031↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

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.

Libarchive: infinite loop denial of service in rar5 decompression via archive_read_data() in libarchive

National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

EUVD-2026-12031

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.