CVE-2026-56623 Apache MINA SSHD vulnerability
Path traversal on Windows in Apache MINA SSHD component sshd-git. Apache MINA SSHD is a Java library for client-side and server-side SSH. A git server implemented with Apache MINA SSHD component sshd-git and running on Windows could allow an authenticated remote user access to git repositories outside of the configured server-side root directory. The path validation applied for CVE-2026-48827 in Apache MINA SSHD 2.18.0 and 3.0.0-M4 was partly ineffective for Servers running on Windows. Applications are affected if they use org.apache.sshd:sshd-git to implement a git server and run on Windows. Applications not using sshd-git or not running on Windows are not affected. Users are advised to upgrade affected applications to Apache MINA SSHD 2.19.0, which fixes the issue. The issue also is present in the pre-release milestones 3.0.0-M1 to 3.0.0-M4 for a new upcoming new major version 3.0.0. Again, applications are affected only if they use sshd-git and run on Windows. Upgrade affected applications to 3.0.0-M5.
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Apache Software Foundation Apache MINA SSHD should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- <= 2.18.0
- <= 3.0.0-M4
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-56623 affects Apache MINA SSHD and involves file access or path traversal. Successful exploitation may disclose files outside the intended directory, including configuration or secret data. Prioritize internet-facing, privileged, automation, and production deployments. Upgrade Apache MINA SSHD to 2.19.0, 3.0.0-M5, or a later fixed release for the deployed branch.
- Inventory every deployment, device, package, plugin, container, build, and environment that uses Apache MINA SSHD.
- Compare the installed version with the recorded affected range: <= 2.18.0, <= 3.0.0-M4.
- Upgrade Apache MINA SSHD to 2.19.0, 3.0.0-M5, or a later fixed release for the deployed branch.
- Until patched, reduce public exposure, disable the affected workflow where practical, and allow access only from trusted users and systems.
- Review configuration, roles, tokens, network paths, and exposed endpoints connected to Apache MINA SSHD; remove access that is not required.
- Review application, system, proxy, and audit logs for requests and behavior linked to the affected feature and CVE.
- If exploitation is suspected, isolate affected assets, preserve evidence, rotate exposed credentials or keys, restore trusted data, and rebuild compromised systems before returning them to service.
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Verify the fix
- Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-56623 in place.
- Use a safe regression test to confirm the affected file access or path traversal path no longer produces the vulnerable behavior.
- Confirm temporary access controls, endpoint restrictions, network blocks, and least-privilege settings remain effective after the update.
- Review post-remediation logs and rerun Fixnx plus the relevant package, dependency, firmware, browser, or product-specific security check.
- Document affected assets, versions, changes, validation evidence, reviewed logs, and any credential rotation, cleanup, or replacement completed.
Related categories
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More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-56623?
Apache Software Foundation Apache MINA SSHD versions listed as affected should be reviewed: <= 2.18.0, <= 3.0.0-M4.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.