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    CVE-2026-81642

    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.

    Published:Sep 16, 2026
    Last Modified:Sep 22, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00521
    CVSS Score:9.8

    Affected Products

    Vendor
    Nlnetlabs
    Product
    Unbound

    Exploits

    https://github.com/suominen/CVE-2026-81642

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    CVE-2026-50106 (CVSS 6.5) — When NLnet Labs Unbound up to and including version 1.26.1 is configured with both a root trust anchor and an …
    CVE-2026-35501 (CVSS 3.7) — When NLnet Labs Unbound 1.0.1 up to and including version 1.26.1 is configured with both a root trust anchor a…
    CVE-2026-109125 (CVSS 5.3) — In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be expos…
    CVE-2026-85501 (CVSS 5.3) — Novel vulnerabilities to launch algorithmic complexity attacks on DNSSEC have been researched under the term '…
    CVE-2026-82720 (CVSS 5.9) — NLnet Labs Unbound 1.12.0 up to and including 1.26.0 has a use-after-free vulnerability when compiled for DNS-…
    CVE-2026-82717 (CVSS 8.4) — In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt …
    CVE-2026-81634 (CVSS 7.5) — In NLnet Labs Unbound up to and including 1.26.0, a 255 length query name with a large TCP response can lead t…
    CVE-2026-80225 (CVSS 5.3) — In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High