CVE-2026-55646 PUBLISHED

vLLM speech-to-text endpoints allocate full upload before enforcing the audio file-size limit

Assigner: GitHub_M
Reserved: 16.06.2026 Published: 06.07.2026 Updated: 06.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 6.5

Product Status

Vendor vllm-project
Product vllm
Versions
  • Version >= 0.22.0, < 0.24.0 is affected

References

Problem Types

  • CWE-400: Uncontrolled Resource Consumption CWE
  • CWE-770: Allocation of Resources Without Limits or Throttling CWE