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.
Affected products
libssh: libssh; redhat: hardened images; redhat: enterprise linux
References6
- access.redhat.com/errata/RHSA-2026:42922 Vendor Advisory
- access.redhat.com/security/cve/CVE-2026-59845 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2498178 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:55855
- access.redhat.com/errata/RHSA-2026:62217
- access.redhat.com/errata/RHSA-2026:62218
Metrics
- CVSS 3.1
-
5.9
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 1 · as of 14 November 2026
- CWE
- CWE-390
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.