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Vulnerability record · CVE-2026-12891 · published 23 June 2026

CVE-2026-12891: Gstreamer out-of-bounds read vulnerability

Gstreamer · Gstreamer

A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.

4.3 CVSS 3.1 Medium EPSS 0.39% · top 69.6% CWE-125 · Out-of-bounds read
4.3CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
3References
1 Jul 2026Last modified by NVD

Description

A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.

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

Affected products

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

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-12891 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2491318 Third Party Advisory
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5109 Not Applicable

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Source: NIST National Vulnerability Database (record CVE-2026-12891), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.