CVE-2026-59845 — MEDIUM (5.3)

Vulnerability Description

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Libssh	Libssh	-
Redhat	Hardened Images	-
Redhat	Enterprise Linux	8.0

Related Weaknesses (CWE)

CWE-390

References

https://access.redhat.com/errata/RHSA-2026:42922Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:55855
https://access.redhat.com/security/cve/CVE-2026-59845Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2498178Issue TrackingVendor Advisory

FAQ

What is CVE-2026-59845?

CVE-2026-59845 is a vulnerability with a CVSS score of 5.3 (MEDIUM). A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree,...

How severe is CVE-2026-59845?

CVE-2026-59845 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-59845?

Check the references section above for vendor advisories and patch information. Affected products include: Libssh Libssh, Redhat Hardened Images, Redhat Enterprise Linux.