CVE-2026-82399— CoreDNS: Unauthenticated memory exhaustion in custom transports
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 is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC request paths in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack on attack
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-82399
Vulnerability Information
Shenlong is analyzing...
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
CoreDNS: Unauthenticated memory exhaustion in custom transports
Source: CVE Program / CVE List V5
Vulnerability Description
CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC request paths in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack on attacker-controlled DNS section counts before dns.DefaultMsgAcceptFunc validates the fixed header. An unauthenticated client can use DNS name compression and excessive section counts to amplify allocation before the plugin chain, so plugin-level rate limiting cannot prevent concurrent requests from exhausting memory and terminating CoreDNS. The ordinary UDP and TCP listeners are not affected because they validate the header first. This issue is fixed in version 1.14.7.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-82399
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-82399
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-82399 (1)
-
Merge commit from fork · coredns/coredns@530b0a5 · GitHub x_refsource_MISC
Other References for CVE-2026-82399 (2)
-
Release v1.14.7 · coredns/coredns · GitHub x_refsource_MISC
IV. Related Vulnerabilities
Same product: coredns
-
CVE-2026-86003
CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP -
CVE-2026-62299
CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer pa -
CVE-2026-62309
CoreDNS: proxyproto plugin panics on PPv2 datagram with non- -
CVE-2026-62994
CoreDNS `k8s_external` headless AXFR can emit an empty trans -
CVE-2026-35579
CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and D
Same vendor: coredns
-
CVE-2026-86003
CoreDNS DoH/DoQ/gRPC bypass UPDATE rejection enforced on UDP -
CVE-2026-62299
CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer pa -
CVE-2026-62309
CoreDNS: proxyproto plugin panics on PPv2 datagram with non- -
CVE-2026-62994
CoreDNS `k8s_external` headless AXFR can emit an empty trans -
CVE-2026-35579
CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and D
Same weakness: CWE-770
-
CVE-2026-81176
Svelte devalue: DoS via malformed input -
CVE-2026-75516
RabbitMQ Java client: Frame-level OOM: Math.min(maxInboundMe -
CVE-2026-57173
vLLM: Unauthenticated audio decompression-bomb DoS in /v1/ch -
CVE-2026-77409
RabbitMQ amqp091-go: Denial of Service via Synchronous Event -
CVE-2026-77403
RabbitMQ amqp091-go: Denial of Service via Sub-Spec Frame Si
V. Comments for CVE-2026-82399
No comments yet