Libsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string
Red Hat · Red Hat Enterprise Linux 10
6.5MediumCVSS 3.1
Recommended action
Within 7 days
Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
Published severityMedium→Operational priority:High, raised one band.upgradedsince 15 Jul 2026
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 0.39% for the current model date.
Compensating controls
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 Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
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.
8 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
libsoup2.4
Affected, no fix publishedDebian currently tracks this release as open.
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.
libsoup as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-2_4-1 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-3_0-0 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-devel as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-lang as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup2 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup2-devel as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup2-lang as component of SUSE Linux Enterprise Desktop 15 SP7
typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise Desktop 15 SP7
typelib-1_0-Soup-3_0 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup as component of SUSE Linux Enterprise High Performance Computing 12 SP5
libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
Summary
An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.
Remediation
No remediation text is recorded.
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-2026-44435
No EUVD known-exploited evidence
ENISA has published the identifier mapping but no EUVD description has been stored yet.
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
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days
Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
Fix not verified
01
What, why and how
An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.
What
An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.
Why
The product reads data past the end, or before the beginning, of the intended buffer.
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
An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.
Why
The product reads data past the end, or before the beginning, of the intended buffer.
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 → Out-of-bounds Read → 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-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.
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:L/I:N/A:L
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.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited 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.
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2026-44435Official EUVD mapping
0 linked advisory records.
Official EUVD record ↗BSI · German · WID-SEC-2026-2919IBM App Connect Enterprise: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.
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.
Fix not verified
Affected
libsoup as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-2_4-1 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-3_0-0 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-devel as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup-lang as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup2 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup2-devel as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup2-lang as component of SUSE Linux Enterprise Desktop 15 SP7
typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise Desktop 15 SP7
typelib-1_0-Soup-3_0 as component of SUSE Linux Enterprise Desktop 15 SP7
libsoup as component of SUSE Linux Enterprise High Performance Computing 12 SP5
libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
libsoup-2_4-1-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP5
libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 12 SP5
typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
libsoup as component of SUSE Linux Enterprise High Performance Computing 15 SP1
libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 15 SP1
libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1
libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 15 SP1
typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise High Performance Computing 15 SP1
libsoup as component of SUSE Linux Enterprise High Performance Computing 15 SP2
libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 15 SP2
libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2
libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 15 SP2
typelib-1_0-Soup-2_4 as component of SUSE Linux Enterprise High Performance Computing 15 SP2
libsoup as component of SUSE Linux Enterprise High Performance Computing 15 SP3
libsoup-2_4-1 as component of SUSE Linux Enterprise High Performance Computing 15 SP3
libsoup-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP3
libsoup-lang as component of SUSE Linux Enterprise High Performance Computing 15 SP3
and 264 more
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
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 14 Jul 2026 · Last source change 15 Jul 2026, 14:09 UTC · CWE-125 · Out-of-bounds Read
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-2026-44435
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD not scheduled
Core structured fields are present and their contributing authorities are shown above.
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.