CVE-2026-53702 Gstreamer1-plugins-bad-free: gstreamer: stack buffer overflow in h.265 buffering period sei parser
A stack buffer overflow in the GStreamer H.265 parser allows attackers to cause crashes or execute code via crafted video files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-53702?
CVE-2026-53702 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 11 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-53702?
How do I fix CVE-2026-53702?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-53702 being exploited?
There is no known exploitation of CVE-2026-53702 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-53702, ECHO-1c25-a74a-9071, GHSA-gmqw-mqj2-6j9j, OESA-2026-2793, UBUNTU-CVE-2026-53702.