Description
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.
Published: 2026-09-30
Score: 8.1 High
EPSS: < 1% Very Low
KEV: No
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Remediation

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History

Wed, 30 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 30 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache mina Sshd
Vendors & Products Apache
Apache mina Sshd

Wed, 30 Sep 2026 11:30:00 +0000

Type Values Removed Values Added
References

Wed, 30 Sep 2026 10:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Apache MINA SSHD: Repeated-publickey policy bypass on server
Weaknesses CWE-304
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


Subscriptions

Apache Mina Sshd
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-09-30T14:29:38.124Z

Reserved: 2026-09-19T12:21:52.758Z

Link: CVE-2026-93994

cve-icon Vulnrichment

Updated: 2026-09-30T10:14:09.612Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-30T10:17:17.460

Modified: 2026-09-30T16:13:13.493

Link: CVE-2026-93994

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T13:00:14Z

Weaknesses
  • CWE-304

    Missing Critical Step in Authentication