CVE-2026-33190: CoreDNS is a DNS server that chains plugins

Q: How do I fix CVE-2026-33190?

coredns: upgrade to 1.14.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-33190 being exploited?

CVE-2026-33190 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33190 affect?

CVE-2026-33190 affects coredns. Severity is high (CVSS 7.5). 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 performin

Q: How urgent is CVE-2026-33190?

Priority 44/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-33190 is a high-severity flaw (CVSS 7.5) affecting coredns. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 all

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-303
Published	2026-05-05
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: coredns.io

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 20:16 UTCPublished CVE record published
2026-07-24 23:10 UTCUpdated Record last modified

coredns.io coredns UPGRADE

Affected: < 1.14.3

Fixed in: 1.14.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy coredns || rpm -q coredns || coredns --version

2. UPGRADE to 1.14.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade coredns

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade coredns

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33190?

coredns: upgrade to 1.14.3. Exact commands for each OS are on this page.

Is CVE-2026-33190 being exploited?

CVE-2026-33190 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33190 affect?

CVE-2026-33190 affects coredns. Severity is high (CVSS 7.5). 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 performin

How urgent is CVE-2026-33190?

Priority 44/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-32936 HIGH 7.5 UPGRADE CoreDNS is a DNS server that chains plugins
CVE-2026-32934 HIGH 7.5 UPGRADE CoreDNS is a DNS server that chains plugins
CVE-2026-33489 HIGH 7.5 UPGRADE CoreDNS is a DNS server that chains plugins
CVE-2026-35579 CRITICAL 9.8 UPGRADE CoreDNS is a DNS server written in Go
CVE-2026-62299 MEDIUM 5.3 UPGRADE CoreDNS is a DNS server written in Go

References

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