CVE-2026-34981CWE-918

whisperX REST API: SSRF in download_from_url() — URL validation happens after HTTP request, extension bypass via .mp3

Medium · published April 6, 2026

CVSS v3.1
5.8
EPSS
0%
Percentile
34.9
In the wild
Unconfirmed
What it is

The whisperX API is a tool for enhancing and analyzing audio content. From 0.3.1 to 0.5.0, FileService.download_from_url() in app/services/file_service.py calls requests.get(url) with zero URL validation. The file extension check occurs AFTER the HTTP request is already made, and can be bypassed by appending .mp3 to any internal URL. The /speech-to-text-url endpoint is unauthenticated. This vulnerability is fixed in 0.6.0.

The record
Technical detail
CVSS v3.1
5.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00417 · 34.9th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-04-06T16:19Z
EPSS history
Timeline
  • 06 APR 16:19Z
    whisperX REST API: SSRF in download_from_url() — URL validation happens after HTTP request, extension bypass via .mp3
    cvelistv5