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Vulnerability record · CVE-2025-59937 · published 29 September 2025

CVE-2025-59937: Pebcak go-mail argument injection vulnerability

PPebcak · Go Mail

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

8.2 CVSS 4.0 High EPSS 0.54% · top 56.7% CWE-88 · Argument injection
8.2CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/wneessen/go-mail/commit/42e92cfe027be04aff72921adb0f72f11d517479 Patch
https://github.com/wneessen/go-mail/issues/495 ExploitIssue Tracking
https://github.com/wneessen/go-mail/pull/496 Issue TrackingPatch
https://github.com/wneessen/go-mail/security/advisories/GHSA-wpwj-69cm-q9c5 Vendor Advisory
https://github.com/wneessen/go-mail/issues/495 ExploitIssue Tracking

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-59937), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.