Improper Certificate Validation Affecting std/crypto/x509 package, versions <1.24.11>=1.25.0 <1.25.5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 Jan 2026
- disclosed2 Dec 2025
- creditUnknown
Introduced: 2 Dec 2025
CVE-2025-61727 (opens in a new tab)How to fix?
Upgrade std/crypto/x509 to version 1.24.11, 1.25.5 or higher.
Overview
std/crypto/x509 is a Go standard library package std/crypto/x509
Affected versions of this package are vulnerable to Improper Certificate Validation.
Go Vulnerability Report:
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.