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archive/Patch now/AIR-2026-0315
closedclosed 12 Oct 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-109311: vLLM audio transcription endpoint heap overflow vulnerability

vLLM

vLLM before version 0.29.0 improperly validates uploaded audio passed to FFmpeg, exposing an IAMF parser heap overflow. Remote attackers can upload malformed containers to corrupt the heap and crash the API process.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
7.1
EPSS
<0.01 · top 59% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
12 Oct 2026
last update
12 Oct 2026
CVE ids
CVE-2026-109311other records

Timeline · 1

  1. 12 Oct 2026CVE-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…

Sources · 1

Advisories and databases

  1. 2026-10-12
    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…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-109311

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
heap-overflowvllm
dates
happened 12 Oct 2026 · first reported 12 Oct 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 06:33Z · updated 2026-10-18 06:33Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-109311: vLLM audio transcription endpoint heap overflow vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-109311-vllm-audio-transcription-endpoint-heap-overf · AIR-2026-0315 · closed 2026-10-12

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-12
- AI role: Attack on AI
- Products: vLLM
- CVE ids: CVE-2026-109311
- CVSS: 7.1

## Summary

vLLM before version 0.29.0 improperly validates uploaded audio passed to FFmpeg, exposing an IAMF parser heap overflow. Remote attackers can upload malformed containers to corrupt the heap and crash the API process.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-10-12: 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… (https://nvd.nist.gov/vuln/detail/CVE-2026-109311)

## Sources

- 2026-10-12 NVD: 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… https://nvd.nist.gov/vuln/detail/CVE-2026-109311

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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