Medium severity · published Jul 6, 2026
CVE-2026-55646
vLLM speech-to-text endpoints allocate full upload before enforcing the audio file-size limit
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
vLLM is an inference and serving engine for large language models. From 0.22.0 to 0.23.0, the /v1/audio/transcriptions and /v1/audio/translations routes call request.file.read() to fully materialize an uploaded audio file into memory before vLLM checks the documented VLLM_MAX_AUDIO_CLIP_FILESIZE_MB compressed upload size limit (default 25 MB) later in the speech-to-text preprocessing step, so an API caller who can reach those routes can submit an oversized multipart upload and cause vLLM to allocate memory proportional to the uploaded file size before the request is rejected as too large, creating memory pressure or terminating the process depending on deployment resource limits. This issue is fixed in version 0.24.0.
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 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VL
vllm · vllm-project
>= 0.22.0, < 0.24.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55646
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55646
Patch
https://github.com/vllm-project/vllm/commit/b997071ec493765abbed990c65843ed05e4708a8
Issue Tracking
https://github.com/vllm-project/vllm/pull/45510
Vendor Advisory
https://github.com/vllm-project/vllm/security/advisories/GHSA-v82g-2437-67m2
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