8.2

CVE-2026-33489: CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison

Analyzed
AliasesCGA-62r3-gf9h-x43vCGA-ffmf-fw9c-rjcqCGA-hv84-hqfm-72xj
Published 05-05-2026Last modified 05-05-2026

Vulnerability summary

CVE-2026-33489 is a high (CVSS 8.2) Incorrect Authorization vulnerability in coredns. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34.7% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.40%
0%100%
Low · -0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-Q7GQ-FH35-9FJF

Timeline

  1. 05-05-2026
    PublishedVulnerability first disclosed.
  2. 05-05-2026
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

Decrease -0.02 pp

From 0.42% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Coredns

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard22 products
  • coredns-1.13All versions (No fix recorded)
  • coredns-fips-1.13All versions (No fix recorded)
  • eks-distro-coredns-1.30All versions (No fix recorded)
  • eks-distro-coredns-1.31< 1.31.43-r2
  • eks-distro-coredns-1.32< 1.32.36-r2
Wolfi5 products
  • coredns-1.13All versions (No fix recorded)
  • juicefs-1.3< 1.3.1-r14
  • k8s_gateway< 1.8.0-r1
  • kubernetes-dns-node-cache< 1.26.8-r3
  • kuma-coredns-1.13All versions (No fix recorded)
Coredns1 product
Coredns.io1 product
Github.com/coredns1 product
  • coredns< 1.14.3

5 vendors · 30 products

References

5 links