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Details of issue NIXPKGS-2026-0045

NIXPKGS-2026-0045
published 6 months, 1 week ago
Permalink CVE-2026-23829
5.3 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): Low (L)
  • Availability (A): None (N)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): Low (L)
  • Modified Availability (MA): None (N)
updated 6 months, 1 week ago by @LeSuisse Activity log
  • Created suggestion 6 months, 1 week ago
  • @LeSuisse accepted 6 months, 1 week ago
  • @LeSuisse published on GitHub 6 months, 1 week ago
Mailpit has SMTP Header Injection via Regex Bypass

Mailpit is an email testing tool and API for developers. Prior to version 1.28. Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\r` and `\n` when used inside a character class. Version 1.28.3 fixes this issue.

Affected products

mailpit
  • ==< 1.28.3

Matching in nixpkgs

pkgs.mailpit

Email and SMTP testing tool with API for developers

Package maintainers

Upstream advisory: https://github.com/axllent/mailpit/security/advisories/GHSA-54wq-72mp-cq7c
Upstream fix: https://github.com/axllent/mailpit/commit/36cc06c125954dec6673219dafa084e13cc14534