What is CVE-2026-125242?

CVE-2026-125242 is a medium-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 4.7/10. Published 2026-11-09.

How severe is CVE-2026-125242?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Ffmpeg

CVE-2026-125242

FFmpeg through 9.0.2 contains a memory leak vulnerability in libavcodec/vdpau.c that allows attackers to exhaust heap memory by aborting pictures before end_frame. Attackers can supply crafted H.264 streams with malformed NAL units that repeatedly abandon pictures, leaking the bitstream_buffers table continuously and causing denial of service.

Published 2026-11-09 · last modified 2026-11-09.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.

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/25231 (issue-tracking)
github.com/FFmpeg/FFmpeg (product)
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vdpau.c (technical-description)
github.com/FFmpeg/FFmpeg/commit/2c6cd8098844f2367f8ba0a3a483e405c8f76449 (patch)
github.com/FFmpeg/FFmpeg/commit/eac2bedcf6245552b39eed32b334851bc6a1b8fa (patch)
www.vulncheck.com/advisories/ffmpeg-through-9.0.2-memory-leak-via-vdpau-hwaccel… (third-party-advisory)

Frequently asked questions

What is CVE-2026-125242?: CVE-2026-125242 is a medium-severity vulnerability in Ffmpeg, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 4.7/10. Published 2026-11-09.
How severe is CVE-2026-125242?: Medium severity. CVSS v3 base score is 4.7 out of 10.