CVE-2026-125182

medium

Description

FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the Cook decoder joint_decode() function because cook_decode_init() does not check js_subband_start against subbands. Attackers can supply a crafted RealMedia file whose extradata causes reads past decode_buffer_0, leaking pointers and decoder state into decoded audio to help defeat ASLR.

References

https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-read-via-cook-decoder-js-subband-start

https://github.com/FFmpeg/FFmpeg/commit/7145d13201c9f9c5253f40295714faa4f4ada1a0

https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cook.c#L854

https://github.com/FFmpeg/FFmpeg

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-120271

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24763

Details

Source: Mitre, NVD

Published: 2026-11-09

Updated: 2026-11-10

Risk Information

CVSS v2

Base Score: 2.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N

Severity: Low

CVSS v3

Base Score: 3.3

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

Severity: Low

CVSS v4

Base Score: 4.8

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00128