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HighFix available

coredns security update

Type: advisorySource: OSV1 source record

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

Announced Source revision 1
Original source ↗

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
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