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Description

A stack buffer overflow flaw was found in the GStreamer H.265 codec parser library (gst-plugins-bad). When parsing a buffering period SEI message, the parser uses an incorrect loop bound derived from cpb_cnt_minus1[i] (the loop index) instead of the sub-layer 0 CPB count cpb_cnt_minus1[0] from the referenced Sequence Parameter Set. A crafted H.265 video file or stream can cause the parser to write beyond the bounds of stack-allocated CPB delay arrays, resulting in a crash or potential stack memory corruption.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-11 | Updated 2026-06-15 | Assigner redhat




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

Out-of-bounds Write

Product status

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-04-16:Reported to Red Hat.
2026-06-10:Made public.

Credits

Red Hat would like to thank Tianshuo Han for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-53702 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2487612 (RHBZ#2487612) issue-tracking

cve.org (CVE-2026-53702)

nvd.nist.gov (CVE-2026-53702)

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