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VULNERABILITIES

CVE-2026-81642 Details

Description

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt [email protected]MitigationPatchVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-122Heap-based Buffer Overflow[email protected]

Affected Products

ProductVersions
nlnetlabs unbound
< 1.26.1

CPE

  • cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-81642
NVD Published Date:
Sep 16, 2026
NVD Last Modified:
Sep 22, 2026
Source:
[email protected]
CVE-2026-81642 Details - Not Deferred