Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-59845

CVE-2026-59845MEDIUM

Red Hat Red Hat Enterprise Linux 10 — Libssh: libssh: denial of service via unchecked proxycommand fork() failure

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   R  C  N  N  H    5.9   .0010    0.9     —

AFFECTED
  Product                      Versions     Fixed
  Red Hat Enterprise Linux 10  unspecified  0:0.12.0-3.el10_2
  Red Hat Enterprise Linux 8   unspecified  0:0.9.6-17.el8_10
  Red Hat Enterprise Linux 8   unspecified  0:0.9.6-17.el8_10
  Red Hat Enterprise Linux 9   unspecified  0:0.10.4-19.el9_8
  Red Hat Enterprise Linux 9   unspecified  0:0.10.4-19.el9_8
  Red Hat Hardened Images      unspecified  0.12.1-4.hum1

TIMELINE
  Jul 7   Reserved by redhat
  Jul 21  Published (CNA: redhat)
  Aug 17  RESCORED — CVE-2026-59845 (Red Hat Enterprise Linux 10). CVSS 5.3 → 5.9 (NVD).

CWE-390 · CNA: redhat · CVSS v3.1 · 6 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 7, 2026	Reserved	Reserved by redhat
July 21, 2026	Published	Published (CNA: redhat)
August 17, 2026	RESCORED	RESCORED — CVE-2026-59845 (Red Hat Enterprise Linux 10). CVSS 5.3 → 5.9 (NVD).

Affected

Affected products and packages — 6 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Enterprise Linux 10	—	—	0:0.12.0-3.el10_2
Red Hat	Red Hat Enterprise Linux 8	—	—	0:0.9.6-17.el8_10
Red Hat	Red Hat Enterprise Linux 8	—	—	0:0.9.6-17.el8_10
Red Hat	Red Hat Enterprise Linux 9	—	—	0:0.10.4-19.el9_8
Red Hat	Red Hat Enterprise Linux 9	—	—	0:0.10.4-19.el9_8
Red Hat	Red Hat Hardened Images	—	—	0.12.1-4.hum1

Weaknesses

CWE-390

References (6)

https://access.redhat.com/errata/RHSA-2026:42922 [Vendor Advisory]
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 [Vendor Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2498178 [Issue Tracking, Vendor Advisory]

Authoritative record: CVE-2026-59845 at cve.org

Vendors: red hat

Weaknesses: CWE-390

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59845 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.