CVE-2026-64834

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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-25)

CWE

CWE-835

Published

2026-07-22

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

Affected

• ffmpeg:ffmpeg

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/11d5f475be95d22d5f0692220cc772b116abc632
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23663
• https://www.vulncheck.com/advisories/ffmpeg-infinite-loop-dos-via-rtp-asf-demuxer

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