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CVE-2026-33810— Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509

Quick assessment

Affected
Go standard library crypto/x509
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.

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。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Go standard library crypto/x509 1.26.0-0< 1.26.2 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-33810

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Vendor Advisories for CVE-2026-33810 (1)

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
Same vendor: Go standard library

V. Comments for CVE-2026-33810

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