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CVE-2026-62994— CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin

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 1.9.4版本至1.14.5之前版本存在异常处理不当漏洞，该漏洞源于在配置k8s_external headless-service zone transfers且Kubernetes包含无声明端口的headless service endpoint时，未检查批次是否为空就索引记录，可能导致网络DNS客户端触发恐慌。

CVSS 3.7 · Low EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification

Affected Version Matrix 1

VendorProduct Version RangeStatus
coredns coredns >= 1.9.4, < 1.14.5 affected
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I. Basic Information for CVE-2026-62994

Vulnerability Information
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Vulnerability Title
CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin
Source: CVE Program / CVE List V5
Vulnerability Description
CoreDNS is a DNS server written in Go. From 1.9.4 until 1.14.5, a network DNS client allowed to request AXFR for a CoreDNS zone can trigger a panic when CoreDNS is configured with k8s_external headless-service zone transfers and Kubernetes contains a headless service endpoint with no declared ports; plugin/kubernetes/object/endpoint.go creates Port: -1, plugin/k8s_external/msg_to_dns.go skips that service, plugin/k8s_external/transfer.go sends an empty []dns.RR batch, and plugin/transfer/transfer.go indexes records[0] without checking the batch is non-empty. This issue is fixed in version 1.14.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
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 1.9.4版本至1.14.5之前版本存在异常处理不当漏洞，该漏洞源于在配置k8s_external headless-service zone transfers且Kubernetes包含无声明端口的headless service endpoint时，未检查批次是否为空就索引记录，可能导致网络DNS客户端触发恐慌。
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 >= 1.9.4, < 1.14.5 -

II. Public POCs for CVE-2026-62994

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III. Intelligence Information for CVE-2026-62994

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Patches & Fixes for CVE-2026-62994 (2)

Vendor Advisories for CVE-2026-62994 (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-2026-62299 5.3 MEDIUM CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downst

IV. Related Vulnerabilities

Same product: coredns
Same vendor: coredns
Same weakness: CWE-248

V. Comments for CVE-2026-62994

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