Vulnerability Description
FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1c10bcc2e17255dacb717a25ab3db142ce3
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24089
- https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-via-rist-protoc
FAQ
What is CVE-2026-75143?
CVE-2026-75143 is a vulnerability with a CVSS score of 9.8 (CRITICAL). FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length i...
How severe is CVE-2026-75143?
CVE-2026-75143 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-75143?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.