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HIGH

CVE-2026-56624

CVSS v3

7.3

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-56624 Red Hat Product Security42 products fixed · 6 known affected

    org.apache.sshd/sshd-core: Apache MINA SSHD: Unauthorized command execution due to improper certificate validation

    jenkins-2-plugins.src as a component of OpenShift Developer Tools and Services · jenkins.src as a component of OpenShift Developer Tools and Services · sshd-core as a component of Red Hat build of Apache Camel - HawtIO 4

  • RHSA-2026:71675 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Build of Apache Camel 4.18.4 for Spring Boot release.

  • RHSA-2026:60259 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.20 security update.

  • RHSA-2026:60256 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.22 security update.

  • RHSA-2026:60254 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.21 security update.

  • RHSA-2026:60252 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.19 security update.

10 more advisories

Full record on NVD

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).

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Published
2026-07-20
Last Modified
2026-07-21

Frequently asked questions

What is CVE-2026-56624?

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).

Is CVE-2026-56624 actively exploited?

Active exploitation of CVE-2026-56624 has not been confirmed. Its EPSS score was 0.3% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-56624?

CVE-2026-56624 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

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