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Vulnerability record · CVE-2026-12892 · published 23 June 2026

CVE-2026-12892: Gstreamer out-of-bounds read vulnerability

Gstreamer · Gstreamer

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.

4.4 CVSS 3.1 Medium EPSS 0.16% · top 95.7% CWE-125 · Out-of-bounds read
4.4CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
3References
6 Jul 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-12892 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2491321 Vendor AdvisoryIssue Tracking
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5108 Not Applicable

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Source: NIST National Vulnerability Database (record CVE-2026-12892), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.