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… (CVE-2026-64834)
FFmpeg versions 0.6.3 through 8.1.2 contain an infinite loop vulnerability in the RTP/ASF demuxer. This flaw occurs in the rtp_asf_fix_header function, which fails to validate a minimum chunk size when processing ASF objects. An attacker can exploit this by sending a crafted RTP/ASF stream that causes the loop pointer to stall, resulting in CPU exhaustion and denial of service.
AI Analysis
Technical Summary
The vulnerability exists in FFmpeg's RTP/ASF demuxer component within libavformat/rtpdec_asf.c. Specifically, the rtp_asf_fix_header function does not enforce a minimum chunk size of 24 bytes for ASF object headers. When a chunk size smaller than this minimum is encountered, the loop pointer does not advance, causing an infinite loop. This can be triggered remotely by sending a malicious RTP/ASF stream, leading to CPU exhaustion and denial of service against the affected system. The affected versions are FFmpeg 0.6.3 through 8.1.2.
Potential Impact
Remote attackers can cause a denial of service by triggering an infinite loop in the RTP/ASF demuxer, leading to CPU exhaustion. This disrupts service availability for legitimate users. There is no indication of code execution or data compromise from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, users should consider disabling RTP/ASF stream processing or filtering untrusted RTP/ASF streams to mitigate exposure.
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… (CVE-2026-64834)
Description
FFmpeg versions 0.6.3 through 8.1.2 contain an infinite loop vulnerability in the RTP/ASF demuxer. This flaw occurs in the rtp_asf_fix_header function, which fails to validate a minimum chunk size when processing ASF objects. An attacker can exploit this by sending a crafted RTP/ASF stream that causes the loop pointer to stall, resulting in CPU exhaustion and denial of service.
CVSS v4.0
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in FFmpeg's RTP/ASF demuxer component within libavformat/rtpdec_asf.c. Specifically, the rtp_asf_fix_header function does not enforce a minimum chunk size of 24 bytes for ASF object headers. When a chunk size smaller than this minimum is encountered, the loop pointer does not advance, causing an infinite loop. This can be triggered remotely by sending a malicious RTP/ASF stream, leading to CPU exhaustion and denial of service against the affected system. The affected versions are FFmpeg 0.6.3 through 8.1.2.
Potential Impact
Remote attackers can cause a denial of service by triggering an infinite loop in the RTP/ASF demuxer, leading to CPU exhaustion. This disrupts service availability for legitimate users. There is no indication of code execution or data compromise from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, users should consider disabling RTP/ASF stream processing or filtering untrusted RTP/ASF streams to mitigate exposure.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-5xcx-3qx2-qv4x
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64834"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a6151269c2644c7f8da62ef
Added to database: 07/22/2026, 23:24:22 UTC
Last enriched: 07/23/2026, 01:07:05 UTC
Last updated: 07/23/2026, 01:07:05 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.