Vulnetix
Try Vulnetix Request Demo
CVE-2026-23829 PUBLISHED CVSS 5.300000190734863 MEDIUM

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.

EPSS 0.90% · 75.5th percentile

Risk Scores

CVSS v3.1
5.300000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS Score
0.90%
75.5th percentile

Affected Products

VendorProductVersions
axllentmailpit< 1.28.3, 0, < 1.28.3
github.comaxllent/mailpit0, 0

Timeline

References

Open in Interactive Console →