High7.5Red Hat Linux

High [CVE-2026-39835] Denial of Service via crafted SSH certificate

This high-severity Red Hat Linux advisory covers CVE-2026-39835 affecting RHEM 1.0 for RHEL 9, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 8).

CVE-2026-39835 Published May 22, 2026

CVE-2026-39835

Affected products & platforms

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Summary

Denial of Service via crafted SSH certificate. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-476.

Affected package(s): advanced-cluster-security/rhacs-roxctl-rhel8:1781686458, advanced-cluster-security/rhacs-scanner-v4-rhel8:1781686458, advanced-cluster-security/rhacs-roxctl-rhel8:1781686446, advanced-cluster-security/rhacs-scanner-v4-rhel8:1781686446, advanced-cluster-security/rhacs-main-rhel8:1781686446, advanced-cluster-security/rhacs-main-rhel8:1781686458.

Resolved in Red Hat advisory RHSA-2026:26547 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: RHEM 1.0 for RHEL 9; Red Hat Enterprise Linux AppStream (v. 10); Red Hat Enterprise Linux AppStream (v. 8); Red Hat Enterprise Linux AppStream (v. 9); and 47 more.

Affected versions

advanced-cluster-security/rhacs-roxctl-rhel8:1781686458
advanced-cluster-security/rhacs-scanner-v4-rhel8:1781686458
advanced-cluster-security/rhacs-roxctl-rhel8:1781686446
advanced-cluster-security/rhacs-scanner-v4-rhel8:1781686446
advanced-cluster-security/rhacs-main-rhel8:1781686446
advanced-cluster-security/rhacs-main-rhel8:1781686458
advanced-cluster-security/rhacs-rhel8-operator:1781686458
advanced-cluster-security/rhacs-rhel8-operator:1781686446

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:26547

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:26547 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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