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CVE-2026-32936— CoreDNS DoH GET path missing size validation causes CPU and memory amplification

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社区的一个 DNS 服务器。 CoreDNS 1.14.3之前版本存在资源管理错误漏洞，该漏洞源于DNS-over-HTTPS GET路径中未对过大的dns查询参数进行大小验证，可能导致远程攻击者造成高CPU使用率和内存压力。

AI Predicted 7.5 Difficulty: Easy EPSS 0.61% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
coredns coredns < 1.14.3 affected
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I. Basic Information for CVE-2026-32936

Vulnerability Information
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Vulnerability Title
CoreDNS DoH GET path missing size validation causes CPU and memory amplification
Source: CVE Program / CVE List V5
Vulnerability Description
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET path accepts oversized dns= query parameter values and performs URL query parsing, base64 decoding, and DNS message unpacking before rejecting the request. Unlike the POST path, which applies a bounded read via http.MaxBytesReader limited to 65536 bytes, the GET path has no equivalent size validation before expensive processing. A remote, unauthenticated attacker can repeatedly send oversized DoH GET requests to force high CPU usage, large transient memory allocations, and elevated garbage-collection pressure, leading to denial of service. This issue has been fixed in version 1.14.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
CoreDNS 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreDNS是CoreDNS社区的一个 DNS 服务器。 CoreDNS 1.14.3之前版本存在资源管理错误漏洞，该漏洞源于DNS-over-HTTPS GET路径中未对过大的dns查询参数进行大小验证，可能导致远程攻击者造成高CPU使用率和内存压力。
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 < 1.14.3 -

II. Public POCs for CVE-2026-32936

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III. Intelligence Information for CVE-2026-32936

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Vendor Advisories for CVE-2026-32936 (1)

Other References for CVE-2026-32936 (1)

Same Patch Batch · coredns · 2026-05-05 · 5 CVEs total

CVE-2026-32934 CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
CVE-2026-33489 CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison
CVE-2026-33190 CoreDNS TSIG authentication bypass on encrypted DNS transports
CVE-2026-35579 CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and DoH3 transports

IV. Related Vulnerabilities

Same product: coredns
Same vendor: coredns
Same weakness: CWE-400

V. Comments for CVE-2026-32936

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