🔴 Critical: Critical Unbound DNSSEC Validator Flaw Could Allow RCE via a Malicious DNS Zone
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Every release of the Unbound DNS resolver prior to 1.26.1 contains a critical heap overflow vulnerability in its DNSSEC validator, according to an advisory published by maintainer NLnet Labs. The flaw can be triggered when an attacker who controls a malicious DNS zone sends queries to a vulnerable resolver, potentially allowing remote code execution.
The vulnerability is tracked as CVE-2026-81642 and is addressed in Unbound 1.26.1, which was released on the same day as the advisory.
Affected versions:
- All Unbound releases before 1.26.1
Mitigation:
- Upgrade to Unbound 1.26.1 as soon as possible.
Source: The Hacker News
Has your organization already patched to Unbound 1.26.1, or are you still assessing exposure?
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