CVE-2026-44502 json
Bugsink: SSRF bypass in `validate_webhook_url`
published 2026-05-08 6 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-31855 , GHSA-fp53-qcf8-2xx2 , PYSEC-2026-2405
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi bugsink 2.1.3
- bugsink bugsink 2.1.3
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | bugsink | <2.1.3 |
2.1.3 |
Affected products
- bugsink bugsink
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7
web
-
github.com
/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2
web
-
github.com
/bugsink/bugsink/releases/tag/2.1.3
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-44502
advisory
-
github.com
/bugsink/bugsink
package
-
pypi.org
/project/bugsink
package
-
github.com
/advisories/GHSA-fp53-qcf8-2xx2
advisory
Sources
- CVE List CVE-2026-44502
- GitHub Advisory GHSA-fp53-qcf8-2xx2
- NVD CVE-2026-44502
- OSV PYSEC-2026-2405
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.