CVE-2026-86003 CoreDNS - Broken Access Control

CoreDNS < 1.14.7 contains a broken access control vulnerability caused by missing dns.DefaultMsgAcceptFunc policy in DNS-over-HTTPS, HTTP/3, QUIC, and gRPC listeners, letting unauthenticated clients perform unauthorized DNS updates, exploit requires upstream trusting CoreDNS source without end-to-end TSIG.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.44% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-441

Vendor fix

Update to version 1.14.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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