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CVE-2026-62299

MEDIUM
5.3
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-62299
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-07-13 18:37 UTC
Published
2026-07-16 19:44 UTC
Last updated
2026-07-16 19:44 UTC
Primary CWE
CWE-476
CWE-476: NULL Pointer Dereference
Vendor / Product
coredns / coredns
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products (1)
VendorProductPlatformVersions
coredns coredns — < 1.14.5
Weakness (CWE)
CWESourceDescription
CWE-476 cna CWE-476: NULL Pointer Dereference
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References (4)
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