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CVE-2025-59937

Pebcak Go-mail vulnerability

9.1 CRITICALPublic exploitEPSS 0.54%
  1. Published29 Sept 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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Pebcak Go-mail< 0.7.1

Remediation

Fixed in
Pebcak Go-mail≥ 0.7.1

References

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Frequently asked

Is CVE-2025-59937 being actively exploited?

CVE-2025-59937 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.54%.

How severe is CVE-2025-59937?

CVE-2025-59937 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2025-59937?

Affected products include Pebcak Go-mail.

How do I fix CVE-2025-59937?

Upgrade affected software to a fixed version, for example Pebcak Go-mail 0.7.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-59937 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.