medium4.3
CVE-2026-44502
Bunsink has an SSRF bypass in `validate_webhook_url`
Impact
Bugsink is a self-hosted error tracking tool. Prior to 2.1.3, Bugsink’s webhook URL validation could be (partially) bypassed because of a mismatch in URL parsing. The original validation logic parsed webhook URLs with Python’s urllib.parse.urlparse, then sent the request with requests.post. For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host. This vulnerability is fixed in 2.1.3.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | bugsink | <= 2.1.2 | 2.1.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fp53-qcf8-2xx2
- https://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2
- https://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7
- https://github.com/bugsink/bugsink/releases/tag/2.1.3
- https://nvd.nist.gov/vuln/detail/CVE-2026-44502