8.1

CVE-2026-93994: apache software foundation apache mina sshd Missing Critical Step in Authentication

CVSS: 8.1v3.1HighAwaiting analysis
AliasesRHSA-2026:71541UBUNTU-CVE-2026-93994DEBIAN-CVE-2026-93994
Published 30-09-2026Last modified 30-09-2026
Open JSON

Vulnerability summary

CVE-2026-93994 is a high (CVSS 8.1) Missing Critical Step in Authentication vulnerability in apache software foundation apache mina sshd. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 22.8% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.32%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:11940-1SUSE-SU-2026:4622-1

Timeline

  1. 30-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

30-09-202618-10-2026
EPSS score
0.32%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat2 products
  • maven3.9< 0:3.9.16-0.3.hum1
  • maven3.9-lib< 0:3.9.16-0.3.hum1
Ubuntu2 products
  • minaAll versions (No fix recorded)
  • mina2All versions (No fix recorded)
Apache software foundation1 product
Debian1 product
  • libmina-sshd-javaAll versions (No fix recorded)

4 vendors · 6 products

References

14 links
Show all 14 references