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CVE-2026-33190

Coredns.io Coredns vulnerability

7.5 HIGHPublic exploitEPSS 0.53%
  1. Published5 May 2026

Description

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 performing verification itself. The DoH and DoH3 writer's TsigStatus() always returns nil, the DoT server does not set TsigSecret on the dns.Server, and the DoQ and gRPC writers also unconditionally return nil. This allows an unauthenticated remote client to bypass TSIG-based authentication and access resources intended to be restricted behind a tsig require all policy. Plain DNS over TCP and UDP are not affected. This issue has been fixed in version 1.14.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Coredns.io Coredns< 1.14.3

Remediation

Fixed in
Coredns.io Coredns≥ 1.14.3

References

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Frequently asked

Is CVE-2026-33190 being actively exploited?

CVE-2026-33190 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.53%.

How severe is CVE-2026-33190?

CVE-2026-33190 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.53% probability of exploitation.

Which products are affected by CVE-2026-33190?

Affected products include Coredns.io Coredns.

How do I fix CVE-2026-33190?

Upgrade affected software to a fixed version, for example Coredns.io Coredns 1.14.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33190 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.