Secuno
ENNL
Book demo

CVE-2026-33489

Coredns.io Coredns broken access control

7.5 HIGHPublic exploitEPSS 0.42%
  1. Published5 May 2026

Description

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 rule depending on zone name ordering (e.g., "example.org." > "a.example.org." lexicographically). This allows an unauthorized remote client to perform AXFR/IXFR for the subzone and retrieve its full zone contents. 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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-163018.5
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before…
CVE-2026-1095598.7
EdgeEver Desktop 1.6.26 through 1.112.0 contains a navigation allowlist bypass that…
CVE-2026-773669.9
obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian…
CVE-2026-1039038.8
An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik…
CVE-2026-1087468.8
Vearch 3.5.2 through 3.5.9 contains an incorrect authorization vulnerability in…
CVE-2026-816499.1
The Fundiin cho WooCommerce WordPress plugin through 3.4.0 does not have proper…

Frequently asked

Is CVE-2026-33489 being actively exploited?

CVE-2026-33489 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-33489?

CVE-2026-33489 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-33489?

Affected products include Coredns.io Coredns.

How do I fix CVE-2026-33489?

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-2026-33489 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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