CVE-2025-59937

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

CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-88 CWE-88

Affected Products

Vendor	Product	Versions
pebcak	go-mail	< 0.7.1

References

Advisories & Patches

https://github.com/wneessen/go-mail/commit/42e92cfe027be04aff72921adb0f72f11d517479 https://github.com/wneessen/go-mail/pull/496 https://github.com/wneessen/go-mail/security/advisories/GHSA-wpwj-69cm-q9c5

Exploits

https://github.com/wneessen/go-mail/issues/495 https://github.com/wneessen/go-mail/issues/495

Frequently Asked Questions

What is CVE-2025-59937? +

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 It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2025-59937? +

CVE-2025-59937 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-59937? +

CVE-2025-59937 affects products from pebcak, specifically: go-mail. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59937? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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