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Vulnerability · Published Jun 23, 2026 · Assigned by redhat

CVE-2026-12892Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 nal extension slice parser

Medium 4.4

In plain English

A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.2%top 95.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12gst-plugins-bad1.01.22.0-4+deb12u8DEBIAN-CVE-2026-12892
Debian:13gst-plugins-bad1.01.26.2-3+deb13u3DEBIAN-CVE-2026-12892
Debian:14gst-plugins-bad1.01.28.5-1DEBIAN-CVE-2026-12892
Ubuntu:25.10gst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-12892
Ubuntu:26.04:LTSgst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-12892
Ubuntu:26.10gst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-12892

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

References