CVE-2026-33489— CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-33489
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- Release v1.14.3 · coredns/coredns · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33489
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
- CVE-2026-35579
CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and D - CVE-2026-32936
CoreDNS DoH GET path missing size validation causes CPU and - CVE-2026-32934
CoreDNS DNS-over-QUIC unbounded goroutine growth leads to de - CVE-2026-33190
CoreDNS TSIG authentication bypass on encrypted DNS transpor - CVE-2026-26017
CoreDNS ACL Bypass
Same vendor: coredns
- CVE-2026-35579
CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and D - CVE-2026-32936
CoreDNS DoH GET path missing size validation causes CPU and - CVE-2026-32934
CoreDNS DNS-over-QUIC unbounded goroutine growth leads to de - CVE-2026-33190
CoreDNS TSIG authentication bypass on encrypted DNS transpor - CVE-2026-26017
CoreDNS ACL Bypass
Same weakness: CWE-863
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