Medium [CVE-2026-42923] Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS
This medium-severity Red Hat Linux advisory covers CVE-2026-42923 affecting unbound-main, Red Hat Enterprise Linux.
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Summary
Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS. Red Hat rates this moderate (CVSS 5.3).
Weakness: CWE-400. Affected package(s): unbound-main.
Resolved in Red Hat advisory RHSA-2026:20357 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux.
- unbound-main-1.25.1-1.hum1
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:20357
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:20357 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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