CVE-2026-33810— Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
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I. Basic Information for CVE-2026-33810
Vulnerability Information
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Vulnerability Title
Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
Source: NVD (National Vulnerability Database)
Vulnerability Description
When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于证书链验证时未正确应用DNS约束，可能导致对通配符DNS SAN的验证错误。
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 |
|---|---|---|---|---|
| Go standard library | crypto/x509 | 1.26.0-0 ~ 1.26.2 | - |
II. Public POCs for CVE-2026-33810
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|---|
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Same Patch Batch · Go standard library · 2026-04-08 · 7 CVEs total
| CVE-2026-32282 | TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix | |
| CVE-2026-32280 | Unexpected work during chain building in crypto/x509 | |
| CVE-2026-32288 | Unbounded allocation for old GNU sparse in archive/tar | |
| CVE-2026-32289 | JsBraceDepth Context Tracking Bugs (XSS) in html/template | |
| CVE-2026-32281 | Inefficient policy validation in crypto/x509 | |
| CVE-2026-32283 | Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS |
IV. Related Vulnerabilities
Same product: crypto/x509
- CVE-2026-32280
Unexpected work during chain building in crypto/x509 - CVE-2026-32281
Inefficient policy validation in crypto/x509 - CVE-2026-27138
Panic in name constraint checking for malformed certificates - CVE-2026-27137
Incorrect enforcement of email constraints in crypto/x509 - CVE-2025-61727
Improper application of excluded DNS name constraints when v
Same vendor: Go standard library
- CVE-2026-39823
Bypass of meta content URL escaping causes XSS in html/templ - CVE-2026-39820
Quadratic string concatentation in consumeComment in net/mai - CVE-2026-33811
Crash when handling long CNAME response in net - CVE-2026-42499
Quadratic string concatenation in consumePhrase in net/mail - CVE-2026-39826
Escaper bypass leads to XSS in html/template
V. Comments for CVE-2026-33810
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