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CVE-2026-23829
Good to know:
Date: January 18, 2026
Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, 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.
Severity Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Top Fix
Upgrade Version
Upgrade to version github.com/axllent/mailpit - v1.28.3;https://github.com/axllent/mailpit.git - v1.28.3
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | LOW |
| Availability (A): | NONE |