CVE-2026-33190— CoreDNS TSIG authentication bypass on encrypted DNS transports
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I. Basic Information for CVE-2026-33190
Vulnerability Information
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Vulnerability Title
CoreDNS TSIG authentication bypass on encrypted DNS transports
Source: NVD (National Vulnerability Database)
Vulnerability Description
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports (DoT, DoH, DoH3, DoQ, and gRPC) because it trusts the transport writer's TsigStatus() instead of performing verification itself. The DoH and DoH3 writer's TsigStatus() always returns nil, the DoT server does not set TsigSecret on the dns.Server, and the DoQ and gRPC writers also unconditionally return nil. This allows an unauthenticated remote client to bypass TSIG-based authentication and access resources intended to be restricted behind a tsig require all policy. Plain DNS over TCP and UDP are not affected. 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
认证算法的不正确实现
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tsig插件信任传输写入器的TsigStatus而非自行验证，可能导致未经身份验证的远程客户端绕过TSIG身份验证。
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-2026-33190
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- Release v1.14.3 · coredns/coredns · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33190
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-2026-33489 | CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison | |
| 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-2026-33489
CoreDNS transfer plugin subzone ACL bypass via lexicographic - 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-2026-26017
CoreDNS ACL Bypass
Same vendor: coredns
- CVE-2026-35579
CoreDNS TSIG authentication bypass on gRPC, QUIC, DoH, and D - CVE-2026-33489
CoreDNS transfer plugin subzone ACL bypass via lexicographic - 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-2026-26017
CoreDNS ACL Bypass
Same weakness: CWE-303
- CVE-2026-27656
Account Takeover via Substring Matching in OpenID Connect Au - CVE-2026-32953
Tillitis: TKey Client has an Error in Protocol Implementatio - CVE-2026-29515
MiCode FileExplorer SwiFTP Server Authentication Bypass - CVE-2019-25436
Sricam DeviceViewer 3.12.0.1 Password Change Security Bypass - CVE-2026-0999
Authentication bypass via userID login when email and userna
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