What is CVE-2026-33190?

CVE-2026-33190 is a high-severity vulnerability in Coredns, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 7.5/10. Published 2026-05-05.

How severe is CVE-2026-33190?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Coredns

CVE-2026-33190

CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports (DoT, DoH, DoH3, DoQ, and gRPC) because it trusts the transport writer's TsigStatus() instead of performi…

EPSS: 0.001 (23.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Coredns — versions < 1.14.3
Coredns.io Coredns

Weakness classification (CWE)

CWE-303 — Incorrect Implementation of Authentication Algorithm

References

https://github.com/coredns/coredns/security/advisories/GHSA-qhmp-q7xh-99rh (x_refsource_CONFIRM, Exploit, Vendor Advisory)
https://github.com/coredns/coredns/releases/tag/v1.14.3 (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-33190?: CVE-2026-33190 is a high-severity vulnerability in Coredns, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 7.5/10. Published 2026-05-05.
How severe is CVE-2026-33190?: High severity. CVSS v3 base score is 7.5 out of 10.