CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET path accepts oversized dns= query parameter values and performs URL query parsing, base64 decoding, and DNS message unpacking before rejecting the request. Unlike the POST path, which applies a bounded read via http.MaxBytesReader limited to 65536 bytes, the GET path has no equivalent size validation before expensive processing. A remote, unauthenticated attacker can repeatedly send oversized DoH GET requests to force high CPU usage, large transient memory allocations, and elevated garbage-collection pressure, leading to denial of service. This issue has been fixed in version 1.14.3.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET
    path accepts oversized dns= query parameter values and performs URL query parsing, base64 decoding, and
    DNS message unpacking before rejecting the request. Unlike the POST path, which applies a bounded read via
    http.MaxBytesReader limited to 65536 bytes, the GET path has no equivalent size validation before
    expensive processing. A remote, unauthenticated attacker can repeatedly send oversized DoH GET requests to
    force high CPU usage, large transient memory allocations, and elevated garbage-collection pressure,
    leading to denial of service. This issue has been fixed in version 1.14.3. (CVE-2026-32936)

An update of the coredns package has been released.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20703-1 advisory.

    Changes in coredns:

    - Update to version 1.14.3:
      * This release introduces Windows service support, along with full TSIG         verification across DoH, DoH3, QUIC, and gRPC transports, and improved         TSIG propagation and DoH request validation.
      * It also adds optional TLS for the metrics endpoint.
      * Performance and stability are improved through cache prefetching, QUIC         optimizations, and a new max_age option in the forward plugin.
      * Additional updates include enhanced SVCB/HTTPS support, improved zone         transfer behavior, and various DNSSEC, PROXY protocol, and concurrency         fixes.
      * The release is built with Go 1.26.2, which includes security         fixes addressing CVE-2026-32282, CVE-2026-32289, CVE-2026-33810,         CVE-2026-27144, CVE-2026-27143, CVE-2026-32288, CVE-2026-32283,         and CVE-2026-27140, and also includes fixes for CVE-2026-32936,         CVE-2026-33190, CVE-2026-33489, CVE-2026-32934, and CVE-2026-35579.

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.

ID	Name	Product	Family	Type	Severity
462744	Echo: github.com/coredns/coredns: security update to 1.14.3	Tenable Cloud Security	Echo Local Security Checks	Local	high
462744	Echo: github.com/coredns/coredns: security update to 1.14.3	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
333808	Photon OS 5.0: Coredns PHSA-2026-5.0-91-0869	Nessus	PhotonOS Local Security Checks	Local	high
321834	Photon OS 4.0: Coredns PHSA-2026-4.0-1038	Nessus	PhotonOS Local Security Checks	Local	high
321475	Photon OS 5.0: Coredns PHSA-2026-5.0-0869	Nessus	PhotonOS Local Security Checks	Local	high
313705	openSUSE 16 Security Update : coredns (openSUSE-SU-2026:20703-1)	Nessus	SuSE Local Security Checks	Local	high
440954	SCA: security update for github.com/coredns/coredns (GHSA-63cw-r7xf-jmwr)	Tenable Cloud Security	SCA Checks	Local	high
440954	SCA: security update for github.com/coredns/coredns (GHSA-63cw-r7xf-jmwr)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-32936

high

Tenable Plugins

high

high

high

high

high

high

high

high