Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2026-109311vLLM before 0.29.0 Heap Overflow DoS via IAMF Audio Transcription Upload
Medium 6.5
In plain English
A medium-severity improper input validation in vllm from vllm-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 58.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vllm-project | vllm | 0 – before 0.29.0 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-m52c-39rh-f3gp) vendor-advisory
- VulnCheck Advisory: vLLM before 0.29.0 Heap Overflow DoS via IAMF Audio Transcription Upload third-party-advisory