7.7

CVE-2026-26017: CoreDNS ACL Bypass

Modified
AliasesCGA-37f4-c478-69p2CGA-435j-vxfp-4vcxCGA-hwm9-3wmh-wp3j
Published 06-03-2026Last modified 15-07-2026

Vulnerability summary

CVE-2026-26017 is a high (CVSS 7.7) vulnerability in coredns. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 36.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.7/10
010
High · v3.1 (CVE.org)
EPSS score
0.42%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 5
OPENSUSE-SU-2026:10297-1OPENSUSE-SU-2026:20619-1OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1042-1CGA-2782-969J-VMFQ

Timeline

  1. 06-03-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 0.48% 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

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

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

Chainguard26 products
  • coredns-1.12All versions (No fix recorded)
  • coredns-1.13All versions (No fix recorded)
  • coredns-fips-1.12All versions (No fix recorded)
  • coredns-fips-1.13All versions (No fix recorded)
  • eks-distro-coredns-1.29All versions (No fix recorded)
Wolfi5 products
  • coredns-1.13All versions (No fix recorded)
  • juicefs-1.3< 1.3.1-r8
  • k8s_gateway< 1.6.4-r2
  • kubernetes-dns-node-cache< 1.26.7-r9
  • kuma-coredns-1.13All versions (No fix recorded)
Coredns1 product
Coredns.io1 product
Github.com/coredns1 product
  • coredns< 1.14.2

5 vendors · 34 products

References

11 links
Show all 11 references