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CVE-2026-33489— CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison

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transfer插件中ACL规则选择错误，可能导致未经授权的远程客户端执行AXFR/IXFR并检索子区域完整内容。

AI Predicted 5.3 Difficulty: Easy EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1071.004 · DNS

Affected Version Matrix 1

VendorProduct Version RangeStatus
coredns coredns < 1.14.3 affected
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I. Basic Information for CVE-2026-33489

Vulnerability Information
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Vulnerability Title
CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison
Source: CVE Program / CVE List V5
Vulnerability Description
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer/transfer.go uses a lexicographic string comparison instead of an actual longest-suffix match to select the winning zone. As a result, a permissive parent-zone transfer rule can override a restrictive subzone rule depending on zone name ordering (e.g., "example.org." > "a.example.org." lexicographically). This allows an unauthorized remote client to perform AXFR/IXFR for the subzone and retrieve its full zone contents. 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:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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transfer插件中ACL规则选择错误，可能导致未经授权的远程客户端执行AXFR/IXFR并检索子区域完整内容。
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-2026-33489

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III. Intelligence Information for CVE-2026-33489

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Vendor Advisories for CVE-2026-33489 (1)

Other References for CVE-2026-33489 (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-2026-32934 CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
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-863

V. Comments for CVE-2026-33489

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