Improper input validation in Vllm-Project Vllm
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp (vendor-advisory)
- www.vulncheck.com/advisories/vllm-before-0.29.0-heap-overflow-dos-via-iamf-audi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109311?
- CVE-2026-109311 is a medium-severity vulnerability in Vllm-Project Vllm, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-10-12.
- How severe is CVE-2026-109311?
- Medium severity. CVSS v3 base score is 6.5 out of 10.