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Fencer Vulns
critical 9.1

CVE-2026-77185 json

Apache MINA SSHD: Asynchronous authentication can bypass signature verification

published 2026-09-30 40 d ago modified 2026-09-30 39 d ago also EUVD-2026-89759

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

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.

Patch / fix

  • Apache Software Foundation Apache MINA SSHD 2.20.0, 3.0.0-M6
  • apache-sshd SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.20.0-150200.5.19.1

suse advisories SUSE-SU-2026:4622-1

  • apache-sshd openSUSE Tumbleweed 2.20.0-1.1

opensuse advisories openSUSE-SU-2026:11940-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-77185 updated cvss 7.4

org.apache.sshd/sshd-core: Apache MINA SSHD: Asynchronous authentication can bypass signature verification

  • Red Hat build of Apache Camel for Spring Boot 4 sshd-core 2.20.0.redhat-00003 Red Hat Enterprise Linux 9 maven-wagon, maven-wagon-javadoc, maven-wagon 3.5.3-9.el10 Red Hat Enterprise Linux 10 maven-wagon 3.5.3-9.el10
    affected: no fix available
  • Red Hat JBoss Enterprise Application Platform 7 sshd-core 2.20.0.redhat-00003, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform 8 sshd-core 2.20.0.redhat-00003 Red Hat Single Sign-On 7 sshd-core 2.20.0.redhat-00003
    affected: no fix available
  • Red Hat Enterprise Linux 7 maven-wagon-scm, maven-wagon-javadoc, maven-wagon 3.5.3-9.el10, maven-wagon-provider-test Red Hat Enterprise Linux 8 maven-wagon, maven-wagon-ftp, maven-wagon-file, maven-wagon-http, maven-wagon-javadoc, maven-wagon-providers, +3 more
    under investigation
  • Red Hat Hardened Images maven3.9 3.9.16-0.3.hum1, maven3.9-lib 3.9.16-0.3.hum1
    fixed: vendor fix RHSA-2026:71541
  • Red Hat OpenShift Developer Tools and Services jenkins, jenkins-2-plugins, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9 Red Hat build of Apache Camel 4 for Quarkus 3 sshd-core 2.20.0.redhat-00003 Red Hat Fuse 7 sshd-core 2.20.0.redhat-00003
    not affected: vulnerable code not present
  • Red Hat JBoss Enterprise Application Platform Expansion Pack sshd-core 2.20.0.redhat-00003
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
39 d ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Apache Software Foundation Apache MINA SSHD

Classification

Weakness
  • CWE-305 Authentication Bypass by Primary Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.