7.3

CVE-2026-56624: apache software foundation apache mina sshd Improper Certificate Validation

CVSS: 7.3v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-56624DEBIAN-CVE-2026-56624
Published 20-07-2026Last modified 23-07-2026
Open JSON

Vulnerability summary

CVE-2026-56624 is a high (CVSS 7.3) Improper Certificate Validation vulnerability in apache software foundation apache mina sshd. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.1% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.29%
0%100%
Low · 0.00 pp in 30 days
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-2026:11327-1SUSE-SU-2026:3339-1

Timeline

  1. 20-07-2026
    PublishedVulnerability first disclosed.
  2. 23-07-2026
    Last modifiedVulnerability information updated.

Description

Improper certificate validation in Apache MINA SSHD (server-side). Apache MINA SSHD is a Java library for client-side and server-side SSH. Server-side OpenSSH user certificate validation during user authentication in an Apache MINA SSHD server did not check for the unsupported force-command or verify-required options that could be embedded in the certificate, nor did it validate these options. As a result it was possible that a user could authenticate with such a certificate that included a force-command option but still was able to execute other commands. What other command exactly would be available to the user depends on the implementation of the server. This issue is fixed in Apache MINA SSHD 2.19.0 and 3.0.0-M5. Applications are advised to upgrade to these versions. The fix rejects OpenSSH user certificates that include these options, since Apache MINA SSHD implements neither force-command nor sk-*-cert-v01@openssh.com user certificates (which are the only ones for which verify-required would make sense).

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.29%

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

Ubuntu2 products
  • minaAll versions (No fix recorded)
  • mina2All versions (No fix recorded)
Apache1 product
  • mina_sshd≥ 2.0.0, < 2.19.0 | 3.0.0:m1 | 3.0.0:m2 | 3.0.0:m3 | 3.0.0:m4
Apache software foundation1 product
Debian1 product
  • libmina-sshd-javaAll versions (No fix recorded)

4 vendors · 5 products

References

6 links