PT-2025-45891 · Julia · Ffmpeg Jll

Published 2025-10-19 · Updated 2025-10-19

OSV

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ff htmlmarkup to ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Related Identifiers

JLSEC-2025-102

Affected Products

Ffmpeg Jll

References · 7

• https://osv.dev/vulnerability/JLSEC-2025-102 · Vendor Advisory
• https://debian.org/security/2019/dsa-4449 · Vendor Advisory
• https://github.com/FFmpeg/FFmpeg/commit/23ccf3cabb4baf6e8af4b1af3fcc59c904736f21 · Note
• https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982 · Note
• http://securityfocus.com/bid/107382 · Note
• https://usn.ubuntu.com/3967-1 · Note
• https://seclists.org/bugtraq/2019/May/60 · Note