CVE-2026-55646CWE-400CWE-770

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

Medium · published July 6, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
43.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00519 · 43.3th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-07-06T19:41Z
EPSS history
Timeline
  • 06 JUL 19:41Z
    vLLM speech-to-text endpoints allocate full upload before enforcing the audio file-size limit
    cvelistv5