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    CVE-2026-19538

    The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.

    Published:Aug 26, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 26, 2026
    EPSS Score:0.00354
    CVSS Score:8.2

    Affected Products

    Vendor
    Nlnetlabs
    Product
    Nsd

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-19401 (CVSS 8.2) — Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special craft…
    CVE-2026-18916 (CVSS 6.9) — Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By cont…
    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-2026-12245 (CVSS 8.7) — NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of…
    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