Gravitl Netmaker up to 1.6.0 Email pro/email/smtp.go certificate validation

Summaryinfo

A vulnerability marked as problematic has been reported in Gravitl Netmaker up to 1.6.0. Affected is an unknown function of the file pro/email/smtp.go of the component Email. Performing a manipulation results in certificate validation. This vulnerability is cataloged as CVE-2026-81034. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Gravitl Netmaker up to 1.6.0. It has been classified as problematic. This affects an unknown code of the file pro/email/smtp.go of the component Email. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. The summary by CVE is:

Netmaker disables certificate verification on the connection to the configured mail server. The sender in pro/email/smtp.go assigns a TLS configuration whose skip-verify field is set to true unconditionally, directly beneath a comment stating that the setting should be false in production. No configuration value governs it and no code path restores verification, so the client accepts any certificate the mail server presents, including one an interposing party supplies. Mail that Netmaker sends over that connection includes password-reset messages carrying single-use tokens and user invitations carrying enrolment links, so a party positioned on the path between the server and its mail relay can read those messages in transit and use a captured reset token before the intended recipient does. The setting is absent from the development branch but present in the latest release.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-81034 since 08/26/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/26/2026). MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Gravitl

Name

• Netmaker

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6.0

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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