CVE-2026-64834: FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer
FFmpeg versions 0.6.3 through 8.1.2 contain an infinite loop vulnerability in the RTP/ASF demuxer within libavformat/rtpdecasf.c that allows remote attackers to cause denial of service by sending a crafted RTP/ASF stream. The rtpasffixheader 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
FFmpeg (libavformat/rtpdec_asf.c RTP/ASF demuxer)to a version that resolves this vulnerability.Fixed in 8.1.2 - Compensating control
Add network-level rate limiting and/or filtering for inbound RTP/ASF traffic reaching FFmpeg instances to reduce the likelihood of CPU exhaustion from crafted RTP/ASF streams while patching.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64834?
CVE-2026-64834 has a severity rating of high, with a score of 7.5.
How do I fix CVE-2026-64834?
To fix CVE-2026-64834, update FFmpeg to a version above 8.1.2 that includes the patch for this vulnerability.
What is the impact of CVE-2026-64834?
CVE-2026-64834 allows remote attackers to cause a denial of service by triggering an infinite loop in the RTP/ASF demuxer.
Which versions of FFmpeg are affected by CVE-2026-64834?
FFmpeg versions from 0.6.3 through 8.1.2 are affected by CVE-2026-64834.
Can CVE-2026-64834 be exploited remotely?
Yes, CVE-2026-64834 can be exploited remotely by sending a crafted RTP/ASF stream.