CVE-2026-109311: Improper Input Validation in vllm-project vllm
Description
CVE-2026-109311 is a high-severity vulnerability in vllm versions before 0.29.0. It involves improper input validation where uploaded audio files are passed to FFmpeg's av.open() fallback with only a file-size check. This exposes the FFmpeg IAMF parser to a heap overflow, allowing authenticated remote attackers to crash the API process by uploading malformed IAMF containers repeatedly.
CVSS v4.0
Score 7.1high
Affected software
vllm-project
vllm
pkg:github/vllm-project/vllmRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
vLLM versions prior to 0.29.0 improperly validate input by only checking the file size of uploaded audio files before passing them to the PyAV/FFmpeg av.open() fallback. This leads to exposure of a heap overflow vulnerability in FFmpeg's IAMF parser. Authenticated remote attackers can exploit this by repeatedly uploading malformed IAMF containers to the /v1/audio/transcriptions endpoint, causing heap corruption and crashing the API process.
Potential Impact
Successful exploitation allows authenticated remote attackers to cause a denial of service by crashing the API process through heap corruption. There is no indication of privilege escalation, code execution, or data disclosure from the provided information.
Mitigation Recommendations
A fix is available in vllm version 0.29.0 and later. Users should upgrade to version 0.29.0 or newer to remediate this vulnerability. No vendor advisory content was provided to indicate alternative mitigations or temporary fixes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-12T14:14:27.021Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acd0c132cdf04f656b11bed
Added to database: 10/12/2026, 16:34:27 UTC
Last enriched: 10/12/2026, 17:18:38 UTC
Last updated: 10/12/2026, 21:46:48 UTC
Views: 10
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