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    CVE-2026-24029

    When the early_acl_drop (earlyACLDrop in Lua) option is disabled (default is enabled) on a DNS over HTTPs frontend using the nghttp2 provider, the ACL check is skipped, allowing all clients to send DoH queries regardless of the configured ACL.

    Published:Mar 31, 2026
    Last Modified:Apr 15, 2026
    EPS:Mar 31, 2026
    EPSS Score:0.00003
    CVSS Score:6.5

    Affected Products

    Vendor
    Powerdns
    Product
    Dnsdist

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-863 Incorrect Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    CVE-2026-40209 (CVSS 5.3) — An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs inst…
    CVE-2026-40208 (CVSS 3.7) — An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid …
    CVE-2026-40011 (CVSS 3.7) — An attacker sending a large number of crafted DNS queries might be able to trigger a dynamic block being inser…
    CVE-2026-33593 (CVSS 7.5) — A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.…
    CVE-2026-33594 (CVSS 5.3) — A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overload…
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    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