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Advisory severityCritical9.1Apache Software Foundation

Critical [CVE-2026-77185] Authentication bypass in sshd-core in Apache MINA SSHD versions 2.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 for a certain (presumed rare) way to implement an SSH server

This critical-severity Apache Software Foundation advisory covers CVE-2026-77185 affecting Apache MINA SSHD.

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CVE-2026-77185 Source published Source updated

VulniPulse record published Record updated

CVE-2026-77185
Affected products & platforms
Apache Software FoundationUnclassified
Open source advisory

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Summary

Authentication bypass in sshd-core in Apache MINA SSHD versions 2.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 for a certain (presumed rare) way to implement an SSH server.

Apache MINA SSHD is a Java library for client- and server-side SSH. In the server part of the library, a mechanism to perform "asynchronous authentication" exists.

A server implemented with Apache MINA SSHD must contain explicit code to make use of this feature. The implementation of this feature was flawed and could potentially lead to skipping checking the signature in public-key or hostbased authentication, or returning a wrong result.

Users are recommended to upgrade to Apache MINA SSHD 2.20.0 or 3.0.0-M6, which fix the logic error and which additionally forbid the use of this "asynchronous authentication" mechanism with the public-key or hostbased authentication schemes: if used, the SSH session will be closed and the server will log an entry indicating that asynchronous authentication may be used only with password or keyboard-interactive authentication.

Affected versions
  • Apache MINA SSHD 2.0.0 before 2.20.0
  • Apache MINA SSHD 3.0.0-M1 before 3.0.0-M6

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions
  • 2.20.0
  • 3.0.0

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Users are recommended to upgrade to Apache MINA SSHD 2.20.0 or 3.0.0-M6, which fix the logic error and which additionally forbid the use of this "asynchronous authentication" mechanism with the public-key or hostbased authentication schemes: if used, the SSH session will be closed and the server will log an entry indicating that asynchronous authentication may be used only with password or keyboard-interactive authentication.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

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