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    CVE-2026-12245

    NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.

    Published:Jun 25, 2026
    Last Modified:Jun 25, 2026
    EPS:Jun 25, 2026
    EPSS Score:0.00264
    CVSS Score:8.7

    Affected Products

    Vendor
    Nlnetlabs
    Product
    Nsd

    Exploits

    No exploit reference

    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-2026-18664 (CVSS 8.2) — When ranges are used for access control (i.e. of the form 1.2.3.4-1.2.3.25), because NSD wrongly compares the …
    CVE-2026-12490 (CVSS 8.2) — When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client ce…
    CVE-2026-12246 (CVSS 7.2) — NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted …
    CVE-2026-12244 (CVSS 8.7) — If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a…
    CVE-2016-6173 (CVSS 7.5) — NSD before 4.1.11 allows remote DNS master servers to cause a denial of service (/tmp disk consumption and sla…
    CVE-2013-5661 (CVSS 5.9) — Cache Poisoning issue exists in DNS Response Rate Limiting.…
    CVE-2012-2978 (CVSS 5) — query.c in NSD 3.0.x through 3.0.8, 3.1.x through 3.1.1, and 3.2.x before 3.2.12 allows remote attackers to ca…

    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