---
id: CVE-2025-59937
title: go-mail is a comprehensive library for sending mails with Go
summary: >-
  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 comma…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-88
  - CWE-88
vendor: pebcak
product: go-mail
affected:
  - go-mail < 0.7.1
patched:
  - go-mail 0.7.1
published: '2025-09-29'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T09:10:00.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-59937'
references:
  - url: >-
      https://github.com/wneessen/go-mail/commit/42e92cfe027be04aff72921adb0f72f11d517479
    label: security-advisories@github.com
  - url: 'https://github.com/wneessen/go-mail/issues/495'
    label: security-advisories@github.com
  - url: 'https://github.com/wneessen/go-mail/pull/496'
    label: security-advisories@github.com
  - url: >-
      https://github.com/wneessen/go-mail/security/advisories/GHSA-wpwj-69cm-q9c5
    label: security-advisories@github.com
  - url: 'https://github.com/wneessen/go-mail/issues/495'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00542
epssPercentile: 0.4377
ingestedAt: '2026-10-09T09:31:00.992Z'
---

## Overview

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

## Affected

- `go-mail < 0.7.1`

## Remediation

Upgrade past the affected range:

- `go-mail 0.7.1`