CVE-2026-109311CWE-20

CVE-2026-109311

Medium · published October 12, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
35.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00422 · 35.4th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-10-12T21:17Z
References (3)
https://github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp · [email protected]https://www.vulncheck.com/advisories/vllm-before-0.29.0-heap-overflow-dos-via-iamf-audio-transcription-upload · [email protected]https://github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:05Z
    vLLM before 0.29.0 Heap Overflow DoS via IAMF Audio Transcription Upload
    cvelistv5
  • 12 OCT 16:05Z
    vLLM before 0.29.0 Heap Overflow DoS via IAMF Audio Transcription Upload
    cvelistv5