CVE-2026-125073

medium

Description

FFmpeg through 9.0.2 contains an infinite loop vulnerability in bit_allocation() in libavcodec/imc.c that allows attackers to hang decoding by supplying audio blocks with a negative bit budget. Attackers can craft IMC or IAC audio files that drive freebits negative, causing the reduction loop to never terminate and consuming 100% CPU.

References

https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-infinite-loop-denial-of-service-via-imc-iac-decoder

https://github.com/FFmpeg/FFmpeg/commit/9b26bb4c9a4457d480899a1bf64ec080eceb1acd

https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/imc.c#L572

https://github.com/FFmpeg/FFmpeg

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-120248

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25696

Details

Source: Mitre, NVD

Published: 2026-11-09

Updated: 2026-11-10

Risk Information

CVSS v2

Base Score: 4.9

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

Severity: Medium

CVSS v3

Base Score: 5.5

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

Severity: Medium

CVSS v4

Base Score: 6.8

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

Severity: Medium

EPSS

EPSS: 0.00165