coredns security update
CoreDNS is a fast and flexible DNS server. The key word here is flexible: with CoreDNS you are able to do what you want with your DNS data by utilizing plugins. Security Fix(es): 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.(CVE-2026-82399) 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
OESA-2026-4196
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:OESA-2026-4196
coredns
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.7.0-1.11.oe2403sp4
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.0-1.11.oe2403sp4"
}
]
}
],
"package": {
"name": "coredns",
"purl": "pkg:rpm/openEuler/coredns&distro=openEuler-24.03-LTS-SP4",
"ecosystem": "openEuler:24.03-LTS-SP4"
},
"database_specific": {
"source": "https://repo.openeuler.org/security/data/osv/OESA-2026-4196.json"
},
"ecosystem_specific": {
"src": [
"coredns-1.7.0-1.11.oe2403sp4.src.rpm"
],
"x86_64": [
"coredns-1.7.0-1.11.oe2403sp4.x86_64.rpm",
"coredns-help-1.7.0-1.11.oe2403sp4.x86_64.rpm"
],
"aarch64": [
"coredns-1.7.0-1.11.oe2403sp4.aarch64.rpm",
"coredns-help-1.7.0-1.11.oe2403sp4.aarch64.rpm"
]
}
}
]Publisher severity
high
Source reference: /database_specific/severity
- Event
- #52136 · Revision 1
- Added to Heist Feed
- Publisher date