CVE-2026-109311

vLLM before 0.29.0 passes uploaded audio to the PyAV/FFmpeg av.open() fallback with only a file-size check, exposing FFmpeg's IAMF parser heap overflow. Authenticated remote attackers can repeatedly upload malformed IAMF containers to /v1/audio/transcriptions, corrupting the heap and crashing the API process.

• https://github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp
• https://www.vulncheck.com/advisories/vllm-before-0.29.0-heap-overflow-dos-via-iamf-audio-transcription-upload
• https://github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp