CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a denial of service vulnerability exists in CoreDNS's loop detection plugin that allows an attacker to crash the DNS server by sending specially crafted DNS queries. The vulnerability stems from the use of a predictable pseudo-random number generator (PRNG) for generating a secret query name, combined with a fatal error handler that terminates the entire process. This issue has been patched in version 1.14.2.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20619-1 advisory.

    Changes in coredns:

    - Update to version 1.14.2:
      * plugin/reload: Allow disabling jitter with 0s
      * bump deps
      * plugin/forward: fix parsing error when handling TLS+IPv6 address
      * plugin/loop: use crypto/rand for query name generation
      * plugin: reorder rewrite before acl to prevent bypass
      * fix(rewrite): fix cname target rewrite for CNAME chains
      * fix(kubernetes): panic on empty ListenHosts
      * chore: bump minimum Go version to 1.25
      * feat(proxyproto): add proxy protocol support
      * refactor(cache): modernize with generics
      * Add metadata for response Type and Class to Log
      * docs: clarify kubernetes auth docs
      * fix: return SOA and NS records when queried for a record CNAMEd to origin

    - fixes bsc#1259320 CVE-2026-26017
    - fixes bsc#1259319 CVE-2026-26018

    - address more unstable unstable tests under aarch64 and s390x

    - Update to version 1.14.1:
      * This release primarily addresses security vulnerabilities affecting Go         versions prior to Go 1.25.6 and Go 1.24.12         (CVE-2025-61728, CVE-2025-61726, CVE-2025-68121, CVE-2025-61731,          CVE-2025-68119).
         It also includes performance improvements to the proxy plugin via          multiplexed connections, along with various documentation updates.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the coredns package has been released.

ID	Name	Product	Family	Severity
310251	openSUSE 16 Security Update : coredns (openSUSE-SU-2026:20619-1)	Nessus	SuSE Local Security Checks	critical
303948	Photon OS 4.0: Coredns PHSA-2026-4.0-0984	Nessus	PhotonOS Local Security Checks	high
303584	Photon OS 5.0: Coredns PHSA-2026-5.0-0794	Nessus	PhotonOS Local Security Checks	medium

Detections

Analytics

CVE-2026-26018

high

Tenable Plugins

critical

high

medium