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    CVE-2026-52684

    If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the child records are used immediately if not expired and thus valid, or the records are expired, and in that case not used. So this case can only happen if almost expired records are used to refresh the authoritative NS records.

    Published:Jul 23, 2026
    Last Modified:Aug 2, 2026
    EPS:Jul 23, 2026
    EPSS Score:0.00143
    CVSS Score:3.7

    Affected Products

    Vendor
    Powerdns
    Product
    Recursor

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-42389 (CVSS 5.3) — This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from auth…
    CVE-2026-52690 (CVSS 5.9) — Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdi…
    CVE-2026-42390 (CVSS 5.3) — An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is conf…
    CVE-2026-42388 (CVSS 5.9) — Incomplete validation of the SOA record present in a catalog zone might lead to a crash.…
    CVE-2026-42387 (CVSS 5.9) — A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of…
    CVE-2026-40012 (CVSS 5.3) — ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations…
    CVE-2026-33612 (CVSS 7.5) — A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache pois…
    CVE-2026-33262 (CVSS 5.9) — An attacker can send replies that result in a null pointer dereference, caused by a missing consistency check …

    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