What’s Vulnerable › Vulnerabilities

CVE-2026-59845: Libssh: libssh: denial of service via unchecked proxycommand fork() failure

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-21 · updated 2026-09-01
• Weakness: CWE-390

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: all versions
• Red Hat Enterprise Linux: 8.0, 9.0, 10.0
• RedHat Hardened Images: all versions

References

• https://access.redhat.com/errata/RHSA-2026:42922
• https://access.redhat.com/errata/RHSA-2026:55855
• https://access.redhat.com/errata/RHSA-2026:62217
• https://access.redhat.com/errata/RHSA-2026:62218
• https://access.redhat.com/security/cve/CVE-2026-59845
• https://bugzilla.redhat.com/show_bug.cgi?id=2498178

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