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TI-2026-32436 Aliases CVE-2026-44502GHSA-fp53-qcf8-2xx2

Bugsink: SSRF bypass in `validate_webhook_url`

Priority LOW 20CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
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 and GitHub. Impact type from CWE-918 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00286 21st percentileScored 2026-11-07
Fix Fixed bugsink (bugsink): 2.1.3bugsink (PyPI): 2.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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

VendorProductAffected versionsFixed inStatusSource
bugsinkbugsinkbefore 2.1.32.1.3Patch availableCNA
—bugsink (PyPI)before 2.1.32.1.3Patch availableGHSA-fp53-qcf8-2xx2
  • bugsink Vendorbugsink Affected before 2.1.3 Fixed in 2.1.3 Patch available CNA
  • bugsink (PyPI) Vendor— Affected before 2.1.3 Fixed in 2.1.3 Patch available GHSA-fp53-qcf8-2xx2

Remediation

  • Fix · CNA bugsink (bugsink) Fixed in 2.1.3
  • Fix · GHSA-fp53-qcf8-2xx2 bugsink (PyPI) Fixed in 2.1.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44502
  2. 2026-10-03 Alias added: GHSA-fp53-qcf8-2xx2

References

Advisory 1

Other 4

  • TI-2026-22000 Bugsink is vulnerable to Stored XSS via Pygments fallback in stacktrace rendering CVSS 3.1CRITICAL 9.3
  • TI-2025-39901 Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU) CVSS 3.1HIGH 7.5
  • TI-2025-39900 Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input CVSS 3.1HIGH 7.5
  • TI-2025-34236 Bugsink is vulnerable to Path Traversal attacks via event_id in ingestion CVSS 4.0HIGH 7.2
  • TI-2026-28977 Bugsink affected by authenticated arbitrary file write in artifactbundle/assemble CVSS 3.1HIGH 7.1
  • TI-2026-38922 Bugsink: DOS using large numbers of event tags CVSS 3.1MEDIUM 4.3
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences