CVE-2025-59937

9.1 CRITICAL
Published: September 29, 2025 Modified: October 16, 2025

Description

go-mail is a comprehensive library for sending mails with Go. In versions 0.7.0 and below, due to incorrect handling of the mail.Address values when a sender- or recipient address is passed to the corresponding MAIL FROM or RCPT TO commands of the SMTP client, there is a possibility of wrong address routing or even ESMTP parameter smuggling. For successful exploitation, it is required that the user's code allows for arbitrary mail address input (i. e. through a web form or similar). If only static mail addresses are used (i. e. in a config file) and the mail addresses in use do not consist of quoted local parts, this should not affect users. This issue is fixed in version 0.7.1

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/wneessen/go-mail/issues/495
Source: security-advisories@github.com
Exploit Issue Tracking
https://github.com/wneessen/go-mail/pull/496
Source: security-advisories@github.com
Issue Tracking Patch
https://github.com/wneessen/go-mail/security/advisories/GHSA-wpwj-69cm-q9c5
Source: security-advisories@github.com
Vendor Advisory
https://github.com/wneessen/go-mail/issues/495
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Issue Tracking

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.1 / 10.0
EPSS (Exploit Probability)
0.1%
19th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

pebcak