CVE-2026-15370 Red Hat CVE debrief

Who should care

Users of libssh SFTP server functionality should assess the risk of directory listing with attacker-controlled filenames. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The libssh library has a vulnerability in its SFTP server directory listing functionality. The longname field is built using unsafe concatenation into a fixed-size stack buffer. This can lead to a stack buffer overflow when listing attacker-controlled filenames, potentially causing server crashes or code execution. Affected product context includes libssh SFTP server functionality. Users of libssh SFTP server functionality should assess the risk of directory listing with attacker-controlled filenames. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review compensating controls for exposed systems while remediation is scheduled and verified. The vulnerability affects users of libssh SFTP server functionality, who should assess the risk of directory listing with attacker-controlled filenames.

Defensive priority

Apply vendor patches or updates to libssh as soon as available. Review and limit SFTP server access to trusted clients. Monitor SFTP server logs for suspicious activity and track exceptions, retest remediated assets.

Recommended defensive actions

• Apply patches or updates to libssh
• Limit SFTP server access to trusted clients
• Monitor SFTP server logs for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-21T09:16:53.683Z and was last modified on 2026-07-22T18:16:55.260Z. The NVD entry is currently Undergoing Analysis. Affected product deployments should be confirmed to exist in managed environments and assigned an owner for follow-up. Official advisories or CVE records should be reviewed to validate affected scope, severity, and vendor guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.