CVE-2026-125202 FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC VAAPI Tile Arrays

High 7.3 Published 9 Nov 2026 Updated 9 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-125202?

CVE-2026-125202 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026.

Official description

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in vaapi_hevc_start_frame() in libavcodec/vaapi_hevc.c that copies unbounded PPS tile counts into fixed-size arrays. Attackers can supply a crafted HEVC bitstream with a large picture and many tiles to write controlled 16-bit values past heap-allocated hwaccel data, corrupting memory in applications decoding with VAAPI.

Weakness: CWE-787

Which versions are affected by CVE-2026-125202?

How do I fix CVE-2026-125202?

No fix has been published for CVE-2026-125202 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-125202 being exploited?

There is no known exploitation of CVE-2026-125202 in the wild and no public exploit code.

Sources

Also known as GHSA-j9qm-j248-h26f, UBUNTU-CVE-2026-125202.