CVE-2026-82399 CoreDNS - Denial of Service

CoreDNS < 1.14.7 contains a denial of service caused by improper validation of DNS section counts in DNS-over-HTTPS, HTTP/3, QUIC, and gRPC request paths, letting unauthenticated clients exhaust memory via amplified allocations, exploit requires network access to affected protocols.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.61% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-770

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

← All CVEs