CVE-2026-109311

Medium

Description

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductVllm

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

vllm-project vllm0.29.0 or later

Vendor advisories

github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp

Affected products

Product	Affected versions	Fixed in
vllm-project vllm	v < 0.29.0	0.29.0

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