Medium 5.3Published Jul 16, 2026

CVE-2026-62299CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record

Updated under an hour ago (Oct 27, 2026, 11:40 PM ET)

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Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

coredns coredns coredns:coredns (from the name)	before 1.14.5	CNA record
coredns.io coredns coredns.io:coredns	before 1.14.5	NVD

References

References

https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7	x-refsource-confirm, exploit, third-party-advisory
https://github.com/coredns/coredns/pull/8190	x-refsource-misc, issue-tracking, patch
https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644c2	x-refsource-misc, patch
https://github.com/coredns/coredns/releases/tag/v1.14.5	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.