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TI-2026-56044 Aliases CVE-2026-81034GHSA-36r8-h3x6-x34c

Netmaker through 1.6.0 Improper Certificate Validation in SMTP Client

Priority HIGH 69CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Spoofing
Confidentiality · integrity · availability
High · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00263 18th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gravitlnetmakerup to 1.6.0—No fix listedCNA
  • netmaker Vendorgravitl Affected up to 1.6.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-81034
  2. 2026-10-03 Alias added: GHSA-36r8-h3x6-x34c

References

Other 3

  • TI-2022-00579 Use of Hard-coded Cryptographic Key in gravitl/netmaker CVSS 3.1CRITICAL 9.8
  • TI-2023-15381 Netmaker has Hardcoded DNS Secret Key CVSS 3.1HIGH 7.5
  • TI-2026-23357 Netmaker: Denial of Service via Server Shutdown Endpoint CVSS 4.0HIGH 8.7
  • TI-2026-23313 Netmaker: Service User with Network Access Can Access config files with WireGuard Private Keys CVSS 4.0HIGH 8.7
  • TI-2022-07702 Use of Hard-coded Cryptographic Key in Netmaker CVSS 3.1HIGH 8.8
  • TI-2023-15383 Netmaker Privilige Escalation Vulnerability CVSS 3.1HIGH 8.8
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences