Medium severity · published Oct 12, 2026
CVE-2026-109311
vLLM before 0.29.0 Heap Overflow DoS via IAMF Audio Transcription Upload
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VL
vllm · vllm-project
before 0.29.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109311
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109311
vendor-advisory
https://github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp
third-party-advisory
https://www.vulncheck.com/advisories/vllm-before-0.29.0-heap-overflow-dos-via-iamf-audio-transcription-upload
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