SSRF (Server-Side Request Forgery) in bugsink (CVE-2026-44502)
Summary
SSRF in bugsink (CVE-2026-44502). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.1.3 or later.
Original description
The description as published by the source.
Summary
Bugsink’s webhook URL validation in versions 2.1.2 and earlier could be (partially) bypassed because of a mismatch in URL parsing.
In some malformed URLs, Python’s standard URL parser (urllib) and the HTTP client stack (requests / urllib3) do not agree on which host is actually being targeted. That could allow a webhook URL to pass Bugsink’s outbound-host checks while the actual HTTP request is sent somewhere else.
Impact
This issue affects Bugsink’s outbound webhook integrations.
An attacker who can supply or influence a webhook URL may be able to make Bugsink send an outbound HTTP POST request to a host that should have been blocked by the webhook validation logic, including loopback,
private, or otherwise non-allowlisted destinations.
The practical impact is limited:
- this is an outbound webhook SSRF issue, not a general-purpose proxy
- Bugsink does not follow redirects for these webhook requests
- the request shape is constrained by how the malformed URL is normalized by the HTTP client
- this does not give arbitrary control over every possible request path
In other words, this is a real validation bypass, but it is narrower than a full arbitrary-request primitive.
Technical Details
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 th…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44502 has been found in bugsink.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade bugsink to 2.1.3 or later.
If unsure, ask your IT team or search "bugsink CVE-2026-44502" on the vendor's site.
CVE-2026-44502 (bugsink) — CWE-918 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Patched: 2.1.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
SSRF (CWE-918) exists in bugsink.
Check the vendor advisory for the affected versions of bugsink.
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.
Update to 2.1.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'bugsink' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'bugsink' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
bugsinkを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade bugsink to 2.1.3ステージング環境で 2.1.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com