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CVE-2025-61727— Improper application of excluded DNS name constraints when verifying wildcard names 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crypto/x509证书链中排除的子域约束未限制通配符SAN在叶证书中的使用，可能导致安全策略绕过。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-61727

Vulnerability Information
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Vulnerability Title
Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509
Source: CVE Program / CVE List V5
Vulnerability Description
An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.
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crypto/x509证书链中排除的子域约束未限制通配符SAN在叶证书中的使用，可能导致安全策略绕过。
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 0 ~ 1.24.11 -

II. Public POCs for CVE-2025-61727

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III. Intelligence Information for CVE-2025-61727

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IV. Related Vulnerabilities

Same product: crypto/x509
Same vendor: Go standard library

V. Comments for CVE-2025-61727

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