Vulnerability · Published Oct 8, 2026 · Assigned by VulnCheck
CVE-2026-107677FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty SegmentTemplate Media
Medium 4.7
In plain English
A medium-severity infinite loop in FFmpeg from FFmpeg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.1%top 96.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
FFmpeg through 9.0.2 contains a denial of service vulnerability in the DASH demuxer that allows attackers to trigger an infinite loop by supplying an empty SegmentTemplate media URL. Attackers can craft an .mpd manifest declaring SegmentTemplate media="" so get_current_fragment() calls av_strireplace() with an empty search string, consuming CPU indefinitely.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ffmpeg | no fix listed | DEBIAN-CVE-2026-107677 |
| Debian:13 | ffmpeg | no fix listed | DEBIAN-CVE-2026-107677 |
| Debian:14 | ffmpeg | no fix listed | DEBIAN-CVE-2026-107677 |
| Ubuntu:26.10 | ffmpeg | no fix listed | UBUNTU-CVE-2026-107677 |
Affected products (as reported)
Weakness: CWE-835 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24592 patch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/ed27bfcbbbc0872c0195eaf4dd2c0c93b9f1778e patch
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/avstring.c#L230-L238 technical-description
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/dashdec.c#L1726 technical-description
- https://ffmpeg.org/ product
- VulnCheck Advisory: FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty SegmentTemplate Media third-party-advisory