Advisory severityMedium5.3Red Hat Linux

Medium [CVE-2026-85501] Denial of Service via algorithmic complexity attacks on DNSSEC

This medium-severity Red Hat Linux advisory covers CVE-2026-85501; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-85501 Source published Sep 16, 2026Source updated Sep 16, 2026

VulniPulse record published Sep 16, 2026Record updated Sep 23, 2026

CVE-2026-85501

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Summary

Denial of Service via algorithmic complexity attacks on DNSSEC. Red Hat rates this moderate (CVSS 5.3).

Weakness: CWE-770. Red Hat lists fixing advisory RHSA-2026:68590 with package unbound-main-1.26.1-1.hum1.

Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 4 more.

Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4; Red Hat package: unbound.

Affected versions

1.26.0

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions

unbound-main-1.26.1-1.hum1
RHSA-2026:68590

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

To mitigate implement hard caps on iterative processing loops and resource allocations per request. Apply rate limiting and set strict connection/processing timeouts to prevent a single complex operation from tying up worker threads. For this specific flaw, administrators can also configure system-level resource constraints (like CPU cgroups) for the service.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Discussion(0)

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