Vulnerability · Published Sep 30, 2026 · Assigned by apache
CVE-2026-93994Apache MINA SSHD: Repeated-publickey policy bypass on server
High 8.1
In plain English
A high-severity security flaw in Apache MINA SSHD from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | libmina-sshd-java | no fix listed | DEBIAN-CVE-2026-93994 |
| Debian:14 | libmina-sshd-java | no fix listed | DEBIAN-CVE-2026-93994 |
| Ubuntu:22.04:LTS | mina | no fix listed | UBUNTU-CVE-2026-93994 |
| Ubuntu:24.04:LTS | mina | no fix listed | UBUNTU-CVE-2026-93994 |
| Ubuntu:26.10 | mina2 | no fix listed | UBUNTU-CVE-2026-93994 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache MINA SSHD | 0 – before 2.20.03.0.0-M1 – before 3.0.0-M6 |
Weakness: CWE-304 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N