CVE-2026-93994
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.
How to fix
- Apache Software Foundation Apache MINA SSHD2.20.0, 3.0.0-M6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Apache Software Foundation Apache MINA SSHD | v < 2.20.0, 3.0.0-M1 ≤ v < 3.0.0-M6 | 2.20.0, 3.0.0-M6 |
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