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

Quick assessment

Affected
coredns coredns
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CoreDNS是CoreDNS团队开源的一个 DNS 服务器。 CoreDNS 1.14.5之前版本存在异常处理不当漏洞，该漏洞源于rewrite插件对edns0规则响应中的OPT记录进行空指针解引用，可能导致远程未经身份验证的客户端通过发送匹配规则的普通DNS查询，引发响应处理程序恐慌，进而导致服务降级或进程崩溃。

CVSS 5.3 · Medium EPSS 0.54% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
coredns coredns < 1.14.5 affected
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I. Basic Information for CVE-2026-62299

Vulnerability Information
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Vulnerability Title
CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
CoreDNS 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreDNS是CoreDNS团队开源的一个 DNS 服务器。 CoreDNS 1.14.5之前版本存在异常处理不当漏洞，该漏洞源于rewrite插件对edns0规则响应中的OPT记录进行空指针解引用，可能导致远程未经身份验证的客户端通过发送匹配规则的普通DNS查询，引发响应处理程序恐慌，进而导致服务降级或进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coredns coredns < 1.14.5 -

II. Public POCs for CVE-2026-62299

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III. Intelligence Information for CVE-2026-62299

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Patches & Fixes for CVE-2026-62299 (2)

Vendor Advisories for CVE-2026-62299 (1)

Same Patch Batch · coredns · 2026-07-16 · 3 CVEs total

CVE-2026-62309 7.5 HIGH CoreDNS: proxyproto plugin panics on PPv2 datagram with non-UDP transport — single 28-byte
CVE-2026-62994 3.7 LOW CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `tra

IV. Related Vulnerabilities

Same product: coredns
Same vendor: coredns
Same weakness: CWE-476

V. Comments for CVE-2026-62299

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