CVE-2026-75145 - FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer
Brief
CVE ID : CVE-2026-75145
Published : Aug. 19, 2026, 4:27 p. m.
- 41 minutes ago
Description : FFmpeg before commit b4c199c contains an incorrect integer narrowing conversion in the AV1 RTP packetizer (libavformat/rtpenc_av1. c). The OBU size is cast to long before comparison against the remaining frame size.
On targets where long is 32 bits, including 64-bit Windows, sufficiently large OBU size values are sign-flipped by the narrowing cast, producing a negative value that passes the payload size check. This allows an oversized OBU to bypass the safety bound on affected platforms, leading to out-of-bounds memory access when the oversized value is subsequently used as a copy length.
Severity: 5.8
- MEDIUM
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