CVE-2025-61727

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.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
golang	go	< 1.24.11
golang	go	1.25 — 1.25.5

References

Advisories & Patches

https://go.dev/cl/723900 https://pkg.go.dev/vuln/GO-2025-4175

Other References

https://go.dev/issue/76442 https://groups.google.com/g/golang-announce/c/8FJoBkPddm4

Frequently Asked Questions

What is CVE-2025-61727? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-61727? +

CVE-2025-61727 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-61727? +

CVE-2025-61727 affects products from golang, specifically: go. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-61727? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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