CVE-2026-64834 FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer
Remote attackers can cause denial of service in FFmpeg by sending crafted RTP/ASF streams that trigger an infinite loop in the demuxer.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64834?
CVE-2026-64834 is a high-severity denial of service vulnerability in Ffmpeg Ffmpeg, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-835
Which versions are affected by CVE-2026-64834?
It affects 1 product.
Products include Ffmpeg Ffmpeg.
How do I fix CVE-2026-64834?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-64834 being exploited?
There is no known exploitation of CVE-2026-64834 in the wild and no public exploit code.
Other vulnerabilities in Ffmpeg Ffmpeg
Sources
Also known as DEBIAN-CVE-2026-64834, ECHO-d56e-2b48-3dd3, GHSA-5xcx-3qx2-qv4x, JLSEC-2026-1176, MINI-pp4c-3wxj-9x8m, UBUNTU-CVE-2026-64834.