What’s Vulnerable › Vulnerabilities

CVE-2026-34981: whisperX REST API: SSRF in download_from_url() — URL validation happens after HTTP request, extension bypass via .mp3

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-06 · updated 2026-10-24
• Weakness: CWE-918

Description

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.

Affected products

• pavelzbornik whisperX-FastAPI: from 0.3.1 before 0.6.0 — fixed in 0.6.0

How to fix

Upgrade to a fixed version: pavelzbornik whisperX-FastAPI 0.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/pavelzbornik/whisperX-FastAPI/commit/ef78fe2001deede5354031e4200d41c6a7e8cbfc
• https://github.com/pavelzbornik/whisperX-FastAPI/issues/256
• https://github.com/pavelzbornik/whisperX-FastAPI/security/advisories/GHSA-6rc7-r867-c635

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