CVE-2026-77185
Received Received - Intake

Authentication Bypass in Apache MINA SSHD

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: Apache Software Foundation

Description
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.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-77185
EUVD
EUVD-2026-89759

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
apache mina From 3.0.0-M1 (inc) to 3.0.0-M5 (inc)
apache mina From 2.0.0 (inc) to 2.19.0 (inc)
apache mina From 3.0.0 (inc) to 3.0.0-M5 (inc)
apache mina sshd

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-305 The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

Attack-Flow Graph

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Executive Summary

This vulnerability is an authentication bypass in Apache MINA SSHD versions 2.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5. It affects servers using a rare implementation of an SSH server with the 'asynchronous authentication' feature. The flaw could skip signature checks in public-key or hostbased authentication or return incorrect results.

Detection Guidance

To detect this vulnerability, check the version of Apache MINA SSHD in use. If your system runs versions 2.0.0 to 2.19.0 or 3.0.0-M1 to 3.0.0-M5, it is vulnerable. Use commands like 'find / -name "sshd-core*.jar" 2>/dev/null' to locate the library and 'java -jar <path-to-jar> --version' to check its version.

Impact Analysis

An attacker could exploit this to bypass authentication and gain unauthorized access to the SSH server. This could lead to data breaches, unauthorized system control, or further network compromise if the server handles sensitive data or services.

Compliance Impact

This vulnerability could lead to unauthorized access to systems using affected Apache MINA SSHD versions, potentially violating data confidentiality and integrity requirements in standards like GDPR and HIPAA. Unauthorized access may result in data breaches, which are reportable under GDPR and could lead to non-compliance with HIPAA's security rule.

Mitigation Strategies

Upgrade Apache MINA SSHD to version 2.20.0 or 3.0.0-M6 or later to fix the authentication bypass flaw.

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