Apache MINA SSHD: Asynchronous authentication can bypass signature verification (CVE-2026-77185) | HOL Guard CVE

Critical · CVSS 9.1CVE-2026-77185

Apache MINA SSHD: Asynchronous authentication can bypass signature verification

Answer in brief

CVE-2026-77185 records a Critical severity (CVSS 9.1) vulnerability in Apache MINA SSHD: Asynchronous authentication can bypass signature verification. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/org.apache.sshd:sshd-core (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/org.apache.sshd:sshd-core (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/org.apache.sshd:sshd-coregeneric	>=2.0.0 <2.20.0 \|\| >=3.0.0-M1 <3.0.0-M6	2.20.0, 3.0.0-M6

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/org.apache.sshd:sshd-core.
Review the reported fix. Update Apache Software Foundation/org.apache.sshd:sshd-core to 2.20.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.