What is CVE-2026-107677?

CVE-2026-107677 is a medium-severity vulnerability in Ffmpeg, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 4.7/10. Published 2026-10-08.

How severe is CVE-2026-107677?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Ffmpeg

CVE-2026-107677

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.

Published 2026-10-08.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Ffmpeg

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24592 (patch)
code.ffmpeg.org/FFmpeg/FFmpeg/commit/ed27bfcbbbc0872c0195eaf4dd2c0c93b9f1778e (patch)
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/avstring.c (technical-description)
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/dashdec.c (technical-description)
ffmpeg.org/ (product)
www.vulncheck.com/advisories/ffmpeg-through-9.0.2-dash-demuxer-infinite-loop-vi… (third-party-advisory)

Frequently asked questions

What is CVE-2026-107677?: CVE-2026-107677 is a medium-severity vulnerability in Ffmpeg, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 4.7/10. Published 2026-10-08.
How severe is CVE-2026-107677?: Medium severity. CVSS v3 base score is 4.7 out of 10.