CVE-2026-82399
highCoreDNS is a DNS server written in Go.
CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC request paths in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack on attacker-controlled DNS section counts before dns.DefaultMsgAcceptFunc validates the fixed header. An unauthenticated client can use DNS name compression and excessive section counts to amplify allocation before the plugin chain, so plugin-level rate limiting cannot prevent concurrent requests from exhausting memory and terminating CoreDNS. The ordinary UDP and TCP listeners are not affected because they validate the header first. This issue is fixed in version 1.14.7.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9 security-advisories@github.com
- https://github.com/coredns/coredns/releases/tag/v1.14.7 security-advisories@github.com
- https://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29 security-advisories@github.com
- https://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29 134c704f-9b21-4f2e-91b3-4a467353bcc0