TI-2026-71127 Aliases CVE-2026-109311 GHSA-8wc5-pcgr-pg48

Heap overflow in vLLM audio transcription crashes the API process

MEDIUM 64CWE-20Published 2026-10-12 · Updated 2026-10-18

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

vLLM before 0.29.0 passes uploaded audio to an FFmpeg fallback that checks only the file size. Improper input validation (CWE-20) lets malformed IAMF containers trigger a heap overflow in FFmpeg's IAMF parser. An authenticated remote attacker with low privileges can repeatedly upload such files to the audio transcriptions endpoint, crashing the API process. CISA SSVC assessment reports proof of concept exploitation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00479 41st percentileScored 2026-11-07

Fix Partial vllm (vllm-project): 0.29.0Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
vllm-project	vllm	before 0.29.0	0.29.0	Patch available	CNA

vllm Vendorvllm-project Affected before 0.29.0 Fixed in 0.29.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:vllm:vllm::::::::	—	—	vLLM

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* Versions — — ·vLLM

Remediation

Upgrade vllm to version 0.29.0, which fixes the flaw. Red Hat lists no available fix for Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3 and Red Hat OpenShift AI (RHOAI).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA vllm (vllm-project) Fixed in 0.29.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat AI Inference Server	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred

Timeline

2026-10-12 Threatist record created from CVE-2026-109311
2026-10-12 Alias added: GHSA-8wc5-pcgr-pg48
2026-10-13 Priority changed: MEDIUM → LOW
2026-10-18 CISA SSVC decision points changed
2026-10-18 Priority changed: LOW → MEDIUM
2026-10-18 Affected versions changed · Red Hat
2026-10-18 CVSS score added · Red Hat

References

Advisory 1

GitHub Security Advisory (GHSA-m52c-39rh-f3gp)

TI-2024-10229 Remote Code Execution in vllm-project/vllm CVSS 3.0CRITICAL 9.8
TI-2024-08404 Remote Code Execution in vllm-project/vllm CVSS 3.1CRITICAL 9.8
TI-2026-36017 vLLM: OpenAI auth bypass CVSS 3.1CRITICAL 9.1
TI-2026-63056 vLLM before 0.28.0 Denial of Service via negative token ID CVSS 4.0HIGH 8.7
TI-2026-04308 Hardcoded trust_remote_code=True in vllm-project/vllm Bypasses User Security Control CVSS 3.0HIGH 8.8
TI-2026-39137 vLLM: Remote DoS in vLLM via Invalid Recovered Token Reinjection CVSS 3.1HIGH 7.5

See all 124 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences