Medium [CVE-2026-12891] global buffer overflow (OOB read) in H.266/VVC VUI parameter parser
This medium-severity Red Hat Linux advisory covers CVE-2026-12891 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
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.
Red Hat Enterprise Linux versions that ship gstreamer1-plugins-bad with H.266/VVC parser support are affected by this vulnerability.
The impact is rated Moderate because exploitation requires user interaction (opening or streaming a malicious H.266 media file) and the information disclosure is limited to 8 bytes from the read-only.data section per malformed frame, making it difficult to extract meaningful sensitive data in practice.
The vulnerability does not lead to code execution or denial of service under normal circumstances. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
Weakness: CWE-125. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: gstreamer1-plugins-bad-free.
Is CVE-2026-12891 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-12891 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-12891?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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