CVE-2026-62299

CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports edns0 rewrite rules with an optional revert flag, and two response rules, edns0SetResponseRule and edns0ReplaceResponseRule[T] in plugin/rewrite/edns0.go, call res.IsEdns0() and immediately dereference the returned *dns.OPT without a nil check when a downstream plugin returns a response with no OPT record. A remote, unauthenticated client can send a single ordinary DNS query matching a rewrite edns0 <local|nsid|subnet> <set|append|replace> ... revert rule, causing ResponseReverter in plugin/rewrite/reverter.go to panic, return SERVFAIL, and degrade availability, or crash the CoreDNS process if the debug directive disables recovery. This issue is fixed in version 1.14.5.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2	Patch
https://github.com/coredns/coredns/pull/8190	Issue Tracking Patch
https://github.com/coredns/coredns/releases/tag/v1.14.5	Release Notes
https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7	Exploit Third Party Advisory
https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:coredns.io:coredns:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-16 20:16

Updated : 2026-07-22 20:18

NVD link : CVE-2026-62299

Mitre link : CVE-2026-62299

CVE.ORG link : CVE-2026-62299

JSON object : View

Products Affected

coredns.io

coredns

CWE

CWE-476

NULL Pointer Dereference

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