CVE-2026-75143 PUBLISHED

FFmpeg Heap Buffer Overflow via RIST Protocol Reader

Assigner: VulnCheck
Reserved: 17.08.2026 Published: 19.08.2026 Updated: 19.08.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Product Status

Vendor FFmpeg
Product FFmpeg
Versions Default: unaffected
  • affected from 0 to 1c10bcc2e17255dacb717a25ab3db142ce390602 (excl.)

Credits

  • Joshua Rogers (AISLE Research) finder

References

Problem Types

  • Heap-based Buffer Overflow CWE