Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Coredns.Io | Coredns | < 1.14.5 |
Related Weaknesses (CWE)
References
- https://github.com/coredns/coredns/commit/fc447d0658b093edc8cd29a6b171216a44a644Patch
- https://github.com/coredns/coredns/pull/8190Issue TrackingPatch
- https://github.com/coredns/coredns/releases/tag/v1.14.5Release Notes
- https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7ExploitThird Party Advisory
- https://github.com/coredns/coredns/security/advisories/GHSA-9pmm-cxww-rrr7ExploitThird Party Advisory
FAQ
What is CVE-2026-62299?
CVE-2026-62299 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 edns0Repl...
How severe is CVE-2026-62299?
CVE-2026-62299 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62299?
Check the references section above for vendor advisories and patch information. Affected products include: Coredns.Io Coredns.