# CVE-2025-61727

## Summary

- **CVE ID:** CVE-2025-61727
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
- **CWE:** N/A
- **Published:** Dec 3, 2025
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- Go standard library — crypto/x509 (0)
- Go standard library — crypto/x509 (1.25.0)

## References

- [CNA](https://go.dev/cl/723900)
- [CNA](https://go.dev/issue/76442)
- [CNA](https://groups.google.com/g/golang-announce/c/8FJoBkPddm4)
- [CNA](https://pkg.go.dev/vuln/GO-2025-4175)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 21.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._