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Fencer Intel
high 8.1

CVE-2026-93994 json

Apache MINA SSHD: Repeated-publickey policy bypass on server

published last mo. modified last mo. also EUVD-2026-89758

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods "publickey,publickey". Apache MINA SSHD provides an equivalent configuration mechanism.

In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass.

Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.

Patch / fix

  • Apache Software Foundation Apache MINA SSHD 2.20.0, 3.0.0-M6
  • libmina-sshd-java Debian 14 2.20.1-1

debian advisories DEBIAN-CVE-2026-93994

  • maven3.9 hummingbird 1 3.9.16-0.3.hum1
  • maven3.9-lib hummingbird 1 3.9.16-0.3.hum1

red hat advisories RHSA-2026:71541

  • 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

Is CVE-2026-93994 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-93994 updated cvss 8.1

org.apache.sshd/sshd-core: Apache MINA SSHD: Authentication bypass via duplicate public key presentation

  • Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, jenkins 2.516.3.1758206866-3.el9, jenkins-2-plugins 4.19.1758207171-1.el9 Red Hat build of Apache Camel 4 for Quarkus 3 sshd-core 2.19.0.redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 sshd-core 2.19.0.redhat-00001
    affected: workaround, 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 JBoss Enterprise Application Platform 7 sshd-core 2.19.0.redhat-00001, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 Red Hat Single Sign-On 7 sshd-core 2.19.0.redhat-00001
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Apache Camel 3.33.4.redhat sshd-core 2.20.0.redhat-00003
    fixed: vendor fix RHSA-2026:83670
  • 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 JBoss EAP 8.1 for RHEL 8 eap8-neethi 3.2.4-1.redhat_00001.1.el8eap, eap8-apache-sshd 2.20.0-1.redhat_00002.1.el8eap, eap8-wildfly 8.1.9.1-1.GA_redhat_00006.1.el8eap, eap8-bouncycastle 1.86.0-1.redhat_00001.1.el8eap, eap8-bouncycastle-pg 1.86.0-1.redhat_00001.1.el8eap, eap8-ironjacamar 3.1.1-1.Final_redhat_00001.1.el8eap, +33 more Red Hat JBoss EAP 8.1 for RHEL 9 eap8-neethi 3.2.4-1.redhat_00001.1.el9eap, eap8-apache-sshd 2.20.0-1.redhat_00002.1.el9eap, eap8-wildfly 8.1.9.1-1.GA_redhat_00006.1.el9eap, eap8-bouncycastle 1.86.0-1.redhat_00001.1.el9eap, eap8-bouncycastle-pg 1.86.0-1.redhat_00001.1.el9eap, eap8-ironjacamar 3.1.1-1.Final_redhat_00001.1.el9eap, +33 more Red Hat JBoss EAP 8.1 for RHEL 10 eap8-neethi 3.2.4-1.redhat_00001.1.el10eap, eap8-apache-sshd 2.20.0-1.redhat_00002.1.el10eap, eap8-wildfly 8.1.9.1-1.GA_redhat_00006.1.el10eap, eap8-bouncycastle 1.86.0-1.redhat_00001.1.el10eap, eap8-bouncycastle-pg 1.86.0-1.redhat_00001.1.el10eap, eap8-ironjacamar 3.1.1-1.Final_redhat_00001.1.el10eap, +32 more
    fixed: vendor fix RHSA-2026:99018
  • Red Hat JBoss Enterprise Application Platform 8.1
    fixed: vendor fix RHSA-2026:99017
  • Red Hat Build of Apache Camel 3.33.4.redhat jimfs 1.1, jna 5.8.0, bcel 6.7.0, gax 2.74.1, icu4j 78.2, joni 2.2.6, +1616 more
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 maven-wagon, maven-wagon-ftp, maven-wagon-file, maven-wagon-http, maven-wagon-javadoc, maven-wagon-providers, +3 more 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
    not affected: component not present
show 2 more
  • Red Hat Fuse 7 sshd-core 2.19.0.redhat-00001
    not affected: vulnerable code not in execute path
  • Red Hat JBoss Enterprise Application Platform Expansion Pack sshd-core 2.19.0.redhat-00001
    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
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Apache Software Foundation Apache MINA SSHD

Classification

Weakness
  • CWE-304 Missing Critical Step in Authentication

References

Sources

Fencer Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.