CVE-2026-75145 — FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer
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 compari…
Published: 2026-08-19 · CVSS: 5.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7