CVE-2026-62299 Details
Description
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.
A denial-of-service vulnerability has been identified in the CoreDNS EDNS0 rewrite plugin, affecting versions prior to 1.14.5. The issue arises when the plugin's response rules, designed to revert EDNS0 options, encounter replies from downstream plugins that lack an OPT record. This scenario leads to a nil-pointer dereference, causing a panic that can either be caught and converted to a SERVFAIL response or, if the debug directive is enabled, crash the entire CoreDNS process.
Users can upgrade to CoreDNS version 1.14.5 or later, where this vulnerability has been fixed. For those unable to upgrade, a temporary workaround is to disable the use of the EDNS0 rewrite response rules that are vulnerable.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 17, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7 | CISA-ADP | ExploitThird Party Advisory |
| https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2 | [email protected] | Patch |
| https://github.com/coredns/coredns/pull/8190 | [email protected] | Issue TrackingPatch |
| https://github.com/coredns/coredns/releases/tag/v1.14.5 | [email protected] | Release Notes |
| https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7 | [email protected] | ExploitThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| coredns.io coredns | < 1.14.5 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | Initial Analysis | [email protected] |
| Jul 17, 2026 | CVE Modified | CISA-ADP |
| Jul 16, 2026 | New CVE Received | [email protected] |