PT-2026-63443 · FFmpeg · Ffmpeg

CVE-2026-64834 · Published 2026-07-22 · Updated 2026-07-22

NVD

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

FFmpeg versions 0.6.3 through 8.1.2 contain an infinite loop vulnerability in the RTP/ASF demuxer within libavformat/rtpdec asf.c that allows remote attackers to cause denial of service by sending a crafted RTP/ASF stream. The rtp asf fix header function fails to validate a minimum chunksize when iterating over ASF objects, causing the loop pointer to never advance when a chunksize is smaller than the 24-byte minimum ASF object header size, resulting in CPU exhaustion that denies service to legitimate users.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2026-64834

Affected Products

Ffmpeg

References · 4

• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/11d5f475be95d22d5f0692220cc772b116abc632 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-64834 · Security Note
• https://vulncheck.com/advisories/ffmpeg-infinite-loop-dos-via-rtp-asf-demuxer · Note
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23663 · Note