whisperX REST API: SSRF in download_from_url() — URL validation happens after HTTP request, extension bypass via .mp3
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| pavelzbornik | whisperX-FastAPI | 0.3.1 to before 0.6.0 | 0.6.0 | Patch available | CNA |
- whisperX-FastAPI Vendorpavelzbornik Affected 0.3.1 to before 0.6.0 Fixed in 0.6.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:pavelzbornik:whisperx_rest_api:*:*:*:*:*:*:*:* | 0.3.1 to before 0.6.0 | Vulnerable | pavelzbornik |
- cpe:2.3:a:pavelzbornik:whisperx_rest_api:*:*:*:*:*:*:*:* Versions 0.3.1 to before 0.6.0 Vulnerable ·pavelzbornik
Remediation
- Fix · CNA whisperX-FastAPI (pavelzbornik) Fixed in 0.6.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34981
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences