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CVE-2026-32934— CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service

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之前版本存在安全漏洞，该漏洞源于DNS-over-QUIC服务器中远程客户端打开大量QUIC流并仅发送1字节，可能导致无限制的goroutine和内存增长。

AI Predicted 7.5 Difficulty: Easy EPSS 0.63% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
coredns coredns < 1.14.3 affected
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I. Basic Information for CVE-2026-32934

Vulnerability Information
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Vulnerability Title
CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
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-QUIC (DoQ) server can be driven into unbounded goroutine and memory growth by a remote client that opens many QUIC streams and sends only 1 byte per stream. When the worker pool is full, CoreDNS still spawns a goroutine per accepted stream to wait for a worker token. Additionally, active workers block indefinitely in io.ReadFull() with no per-stream read deadline, allowing an attacker to pin all workers by sending a single byte so the read blocks waiting for the second byte of the DoQ length prefix. This enables an unauthenticated remote attacker to cause memory exhaustion and OOM-kill. This issue has been fixed in version 1.14.3. No known workarounds exist.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
CoreDNS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreDNS是CoreDNS社区的一个 DNS 服务器。 CoreDNS 1.14.3之前版本存在安全漏洞，该漏洞源于DNS-over-QUIC服务器中远程客户端打开大量QUIC流并仅发送1字节，可能导致无限制的goroutine和内存增长。
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-2026-32934

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III. Intelligence Information for CVE-2026-32934

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Vendor Advisories for CVE-2026-32934 (1)

Other References for CVE-2026-32934 (1)

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

CVE-2026-32936 CoreDNS DoH GET path missing size validation causes CPU and memory amplification
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-770

V. Comments for CVE-2026-32934

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