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Details of issue NIXPKGS-2026-0049

NIXPKGS-2026-0049
published on 20 Jan 2026
Permalink CVE-2026-23845
updated 1 month ago by @LeSuisse Activity log
  • Created automatic suggestion 1 month ago
  • @LeSuisse accepted 1 month ago
  • @LeSuisse published on GitHub 1 month ago
Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.

Affected products

mailpit
  • ==< 1.28.3

Matching in nixpkgs

Package maintainers

Upstream advisory: https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j
Upstream patch: https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe