CVE-2026-107695: FFmpeg before 8.1.3 HLS Demuxer Infinite Loop via Self-Referencing Playlist

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-10-08 · updated 2026-10-14
Weakness: CWE-835

Description

FFmpeg before 8.1.3 contains an infinite loop vulnerability in the HLS demuxer that allows remote attackers to cause denial of service because parse_playlist() accepts Master Playlist tags inside Media Playlists. Attackers can trick victims into opening a crafted self-referencing playlist that endlessly adds variants in hls_read_header(), causing unbounded CPU and I/O consumption.

Affected products

FFmpeg: before 8.1.3 — fixed in 8.1.3

How to fix

Upgrade to a fixed version: FFmpeg 8.1.3. Check the vendor advisory for mitigations.

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23618
https://gist.github.com/OxBat/59574a2940092cda1b6e76bbf96f53d0
https://github.com/FFmpeg/FFmpeg
https://github.com/FFmpeg/FFmpeg/blob/n8.1.2/libavformat/hls.c#L866
https://github.com/FFmpeg/FFmpeg/commit/0e6eef35517a
https://github.com/FFmpeg/FFmpeg/commit/a4ddaba8bb78
https://github.com/FFmpeg/FFmpeg/commit/c364ab176f722bdabc886845e770c9eacbc1e3e5
https://www.vulncheck.com/advisories/ffmpeg-before-8.1.3-hls-demuxer-infinite-loop-via-self-referencing-playlist

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