Nixpkgs security tracker

Login with GitHub

Details of issue NIXPKGS-2026-0381

NIXPKGS-2026-0381
published on
Permalink CVE-2026-27808
5.8 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): LOW
  • Privileges required (PR): NONE
  • User interaction (UI): NONE
  • Scope (S): CHANGED
  • Confidentiality impact (C): LOW
  • Integrity impact (I): NONE
  • Availability impact (A): NONE
updated 1 month, 1 week ago by @LeSuisse Activity log
  • Created automatic suggestion 1 month, 2 weeks ago
  • @LeSuisse accepted 1 month, 2 weeks ago
  • @LeSuisse published on GitHub 1 month, 1 week ago
Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API

Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to Server-Side Request Forgery (SSRF). The server performs HTTP HEAD requests to every URL found in an email without validating target hosts or filtering private/internal IP addresses. The response returns status codes and status text per link, making this a non-blind SSRF. In the default configuration (no authentication on SMTP or API), this is fully exploitable remotely with zero user interaction. This is the same class of vulnerability that was fixed in the HTML Check API (CVE-2026-23845 / GHSA-6jxm-fv7w-rw5j) and the screenshot proxy (CVE-2026-21859 / GHSA-8v65-47jx-7mfr), but the Link Check code path was not included in either fix. Version 1.29.2 fixes this vulnerability.

Affected products

mailpit
  • ==< 1.29.2

Matching in nixpkgs

Package maintainers

Upstream advisory: https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3
Upstream patch: https://github.com/axllent/mailpit/commit/10ad4df8cc0cd9e51dea1b4410009545eef7fbf5