Gstreamer1-plugins-bad: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 nal extension slice parser

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Summary

CVECVE-2026-12892
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-23 21:16:55 UTC
Updated2026-06-24 14:17:30 UTC
DescriptionA flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Problem Types: CWE-125 | CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
3.1CNACVSS4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5108 [email protected] gitlab.freedesktop.org
access.redhat.com/security/cve/CVE-2026-12892 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Ariba Afroz (CoE-CNDS Lab, VJTI, Mumbai, India), Dr. Faruk Kazi (CoE-CNDS Lab, VJTI, Mumbai, India), and Ramesh Adhikari (CoE-CNDS Lab, VJTI, Mumbai, India) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-06-04T11:29:57.000ZReported to Red Hat.
CNA2026-06-22T00:00:00.000ZMade public.

Workarounds

CNA: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.

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