Description
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 listeners in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack without the dns.DefaultMsgAcceptFunc request policy used by UDP, TCP, and DNS-over-TLS. An unauthenticated client can send an RFC 2136 UPDATE that the proxy or forward plugin passes unchanged to an update-capable upstream. If that upstream trusts CoreDNS's source address or connection and does not require an attacker-unknown end-to-end TSIG, the request appears to originate from CoreDNS and can add, replace, or delete DNS records, redirect traffic, take over names, alter mail routing, or disrupt the writable zone. This issue is fixed in version 1.14.7.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| coredns | coredns | < 1.14.7 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | coredns | 1.11.4-22 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | juicefs-1.3 | 1.3.3-r8 | — |
| Wolfi rolling | k8s_gateway | 1.8.2-r11 | — |
| Wolfi rolling | kubernetes-dns-node-cache | 1.26.8-r20 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/coredns/coredns | < 1.14.7 | 1.14.7 | GHSA-9gm5-9rfh-m6vx |
Advisories 1
- WID-SEC-2026-3198 CoreDNS: Schwachstelle ermöglicht Manipulation von DNS Einträgen BSI CERT-Bund (WID) · Sep 16, 2026