CVE-2026-33489: CoreDNS is a DNS server that chains plugins

Q: How do I fix CVE-2026-33489?

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

Q: Is CVE-2026-33489 being exploited?

CVE-2026-33489 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-2026-33489 affect?

CVE-2026-33489 affects coredns. Severity is high (CVSS 7.5). CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer

Q: How urgent is CVE-2026-33489?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-33489 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 transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer/transfer.go uses a lexicographic string comparison instead of an actual longest-suffix match to select the winning zone. As a result, a permissive parent-zone transfer rule can override a restrictive subzone r

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 66%)
CISA exploited list	No
Weakness	CWE-863
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-2026-33489?

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

Is CVE-2026-33489 being exploited?

CVE-2026-33489 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-2026-33489 affect?

CVE-2026-33489 affects coredns. Severity is high (CVSS 7.5). CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer

How urgent is CVE-2026-33489?

Priority 45/100. 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-2026-33190 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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