CVE-2026-86003

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Source
https://cve.org/CVERecord?id=CVE-2026-86003
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86003.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-86003
Aliases
  • GHSA-9gm5-9rfh-m6vx
Downstream
Published
2026-09-16T18:39:22Z
Modified
2026-09-17T03:47:22Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP/TCP
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-441"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86003.json"
}
References

Affected packages

Git / github.com/coredns/coredns

Affected ranges

Type
GIT
Repo
https://github.com/coredns/coredns
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
427fc80ed9ca47f354585eb30a3f1332950856c4
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.14.7"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

v0.*
v0.9.10
v0.9.9
Other
v001
v002
v003
v004
v005
v006
v007
v008
v009
v010
v011
v1.*
v1.0.0
v1.0.1
v1.0.2
v1.0.3
v1.0.5
v1.0.6
v1.1.0
v1.1.1
v1.1.2
v1.1.3
v1.1.4
v1.10.0
v1.10.1
v1.11.0
v1.11.1
v1.11.3
v1.11.4
v1.12.0
v1.12.1
v1.12.2
v1.12.3
v1.12.4
v1.13.0
v1.13.1
v1.13.2
v1.14.0
v1.14.1
v1.14.2
v1.14.3
v1.14.4
v1.14.5
v1.14.6
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.2.5
v1.2.6
v1.3.0
v1.3.1
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.6.7
v1.6.8
v1.6.9
v1.7.0
v1.7.1
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.5
v1.8.6
v1.8.7
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86003.json"