What is CVE-2026-125236?

CVE-2026-125236 is a low-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 3.3/10. Published 2026-11-09.

How severe is CVE-2026-125236?

Low severity. CVSS v3 base score is 3.3 out of 10.

Vulnerability in Ffmpeg

CVE-2026-125236

FFmpeg through 9.0.2 contains a memory leak vulnerability in alloc_frame() in libavcodec/vvc/refs.c that leaks SPS and PPS references when frame buffer allocation fails. Attackers can supply a crafted VVC (H.266) stream that repeatedly replaces parameter sets, steadily growing memory use and causing denial of service.

Published 2026-11-09.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Ffmpeg

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25088 (issue-tracking)
github.com/FFmpeg/FFmpeg (product)
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vvc/refs.c (technical-description)
github.com/FFmpeg/FFmpeg/commit/a13e27336a61a3452e1ab8b4bb132c4174c67498 (patch)
www.vulncheck.com/advisories/ffmpeg-through-9.0.2-vvc-decoder-memory-leak-via-a… (third-party-advisory)

Frequently asked questions

What is CVE-2026-125236?: CVE-2026-125236 is a low-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 3.3/10. Published 2026-11-09.
How severe is CVE-2026-125236?: Low severity. CVSS v3 base score is 3.3 out of 10.