Medium [CVE-2026-53701] Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds write in h.266/vvc pps picture partition parser
This medium-severity Red Hat Linux advisory covers CVE-2026-53701 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
An out-of-bounds write vulnerability was found in GStreamer's H.266/VVC PPS picture partition parser in gst-plugins-bad.
In the multi-slice-in-tile processing of gst_h266_parser_parse_picture_partition() (gsth266parser.c), the loop iterates without checking that the slice index stays within bounds, writing past three fixed-size arrays (slice_height_in_ctus, slice_top_left_ctu_x, slice_top_left_ctu_y) in the GstH266PPS structure.
While the initial proof-of-concept demonstrated a 4-byte out-of-bounds write, the code permits larger writes across multiple iterations. A crafted H.266/VVC media file can trigger this vulnerability.
The H.266/VVC codec parser is part of gst-plugins-bad and is available in GStreamer 1.26 and later. Older versions of GStreamer shipped in Red Hat Enterprise Linux do not include H.266 support and are not affected.
The upstream maintainer confirmed the out-of-bounds write is bounded within preallocated structure arrays and did not cause crashes in testing. Practical exploitation for code execution is considered unlikely with modern hardening such as ASLR and stack protectors.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-787.
Red Hat does not currently list a fixing RHSA for this CVE.
Is CVE-2026-53701 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53701 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-2026-53701?
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 3 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 3 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 3 days ago·verify at source
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