Critical Unbound DNSSEC Validator Flaw Could Allow RCE via a Malicious DNS Zone
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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Raghib Awan
Raghib Awan is an Information Security and Technology professional with expertise spanning cybersecurity, cloud security, IT infrastructure, information risk, regulatory compliance, and enterprise security. He is also an author at TeQManch, a technology and cybersecurity news platform covering cyber threats, artificial intelligence, BFSI technology, data privacy, digital risk, and emerging technology trends.
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