CVE-2025-59937: go-mail is a comprehensive library for sending mails with Go

Q: How do I fix CVE-2025-59937?

go-mail: upgrade to 0.7.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-59937 being exploited?

CVE-2025-59937 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-59937 affect?

CVE-2025-59937 affects go-mail. Severity is critical (CVSS 9.1). 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

Q: How urgent is CVE-2025-59937?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-59937 is a critical-severity flaw (CVSS 9.1) affecting go-mail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 (

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-88
Published	2025-09-29
Last modified	2026-10-09

Publisher (CNA): GitHub, Inc. · Vendor: pebcak

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-29 23:15 UTCPublished CVE record published
2026-10-09 09:10 UTCUpdated Record last modified

pebcak go-mail UPGRADE

Affected: < 0.7.1

Fixed in: 0.7.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy go-mail || rpm -q go-mail || go-mail --version

2. UPGRADE to 0.7.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade go-mail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade go-mail

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-59937?

go-mail: upgrade to 0.7.1. Exact commands for each OS are on this page.

Is CVE-2025-59937 being exploited?

CVE-2025-59937 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-59937 affect?

CVE-2025-59937 affects go-mail. Severity is critical (CVSS 9.1). 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

How urgent is CVE-2025-59937?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs