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    CVE-2026-3039

    BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments. This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

    Published:May 20, 2026
    Last Modified:Sep 10, 2026
    EPS:May 20, 2026
    EPSS Score:0.01047
    CVSS Score:7.5

    Affected Products

    Vendor
    Isc
    Product
    Bind
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-12617 (CVSS 7.5) — The issue is unexpected program termination based on ordering and/or specific content in responses to queries …
    CVE-2026-11605 (CVSS 7.5) — The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all …
    CVE-2026-10723 (CVSS 6.8) — BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authentica…
    CVE-2026-10822 (CVSS 6.5) — If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and m…
    CVE-2026-13204 (CVSS 7.5) — If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RR…
    CVE-2026-11331 (CVSS 7.5) — An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names…
    CVE-2026-11622 (CVSS 7.5) — A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer f…
    CVE-2026-11721 (CVSS 7.5) — It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels …
    CVE-2026-13321 (CVSS 8.6) — The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the si…
    CVE-2026-5950 (CVSS 5.3) — An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling,…

    References

    https://downloads.isc.org/isc/bind9/9.18.49
    https://downloads.isc.org/isc/bind9/9.20.23
    https://downloads.isc.org/isc/bind9/9.21.22
    https://kb.isc.org/docs/cve-2026-3039
    https://access.redhat.com/errata/RHSA-2026:20334
    https://access.redhat.com/errata/RHSA-2026:23360
    https://access.redhat.com/errata/RHSA-2026:24338
    https://access.redhat.com/errata/RHSA-2026:24339
    https://access.redhat.com/errata/RHSA-2026:24367
    https://access.redhat.com/errata/RHSA-2026:24368
    https://access.redhat.com/errata/RHSA-2026:55441
    https://access.redhat.com/errata/RHSA-2026:57189
    https://access.redhat.com/errata/RHSA-2026:60383
    https://access.redhat.com/errata/RHSA-2026:62549
    https://access.redhat.com/security/cve/CVE-2026-3039
    https://bugzilla.redhat.com/show_bug.cgi?id=2479767
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json

    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