Vulnerability details

CVE-2026-64834

FFmpeg FFmpeg

FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer

CVSS 4.0

8.7High

Official description

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 scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`
7.5High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
FFmpeg	FFmpeg	11d5f475be95d22d5f0692220cc772b116abc632	CVEProject cvelistV5 (CNA)
FFmpeg	FFmpeg	0.6.3 ≤ v ≤ 8.1.2	CVEProject cvelistV5 (CNA)

References and advisories

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23663 issue-tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/11d5f475be95d22d5f0692220cc772b116abc632 patch
https://www.vulncheck.com/advisories/ffmpeg-infinite-loop-dos-via-rtp-asf-demuxer third-party-advisory

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Details

Published: 2026-07-22
Last updated: 2026-07-28
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.72%

Probability of exploitation in 30 days

54.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

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