Critical Unbound DNSSEC Validator Flaw Could Allow RCE via a Malicious DNS Zone

Reported by The Hacker News (info@thehackernews.com (The Hacker News))

Summary by Cyber Security News17 Sep 2026, 14:30 CEST

About this summary. This is a short, independently written summary of an article first published by The Hacker News. Cyber Security News did not report or verify the underlying story. Read the original: https://thehackernews.com/2026/09/critical-unbound-dnssec-validator-flaw.html

Every release of the Unbound DNS resolver before 1.26.1 has a critical heap overflow in its DNSSEC validator, maintainer NLnet Labs said in an advisory on Wednesday. An attacker who controls a malicious zone and queries a vulnerable resolver can trigger it, enabling remote code execution. Unbound 1.26.1, released the same day, fixes the bug, tracked as CVE-2026-81642, along with

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