Bug 2552108

Summary:	CVE-2026-100229 gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: out-of-bounds write in gst_h266_parser_parse_dci() due to off-by-one array bound check [fedora-all]
Product:	[Fedora] Fedora	Reporter:	lcelant
Component:	gstreamer1-plugins-bad-free	Assignee:	Yaakov Selkowitz <yselkowi>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	rawhide	CC:	dominik, gwync, multimedia-sig, negativo17, wtaymans, yselkowi
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["b0f2eb42-c69d-4792-9a67-5d60f6492088"]}
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2541471

Description lcelant 2026-10-14 08:12:57 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

GStreamer's H.266 (VVC) codec parser library (libgstcodecparsers) contains an out-of-bounds write vulnerability in gst_h266_parser_parse_dci() in gsth266parser.c (line 4812). CHECK_ALLOWED_MAX(dci->num_ptls_minus1, 15) allows value 15, but GstH266DCI.profile_tier_level[] has only 15 elements (indices 0..14). When dci_num_ptls_minus1 is 15, the loop writes past the structure via gst_h266_parse_profile_tier_level(). H.266 spec defines valid range 0..14; 15 is reserved. Fix: change bound to 14. Introduced in GStreamer 1.26. No in-tree element calls this API. Upstream report awaiting triage, no public patch. Reporter: Bruno Fournier. Tested on 1.29.2 (4cb910d) with ASan. PSIRT: PSIRTSUPT-24646.