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    CVE-2026-97206

    NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.

    Published:Oct 21, 2026
    Last Modified:Oct 21, 2026
    EPS:Oct 21, 2026
    EPSS Score:0.00263
    CVSS Score:7.5

    Affected Products

    Vendor
    Nlnetlabs
    Product
    Unbound

    Exploits

    https://github.com/suominen/CVE-2026-97206

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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-2026-81642 (CVSS 9.1) — In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enabl…
    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