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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0001.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Go standard library crypto/x509 unaffected
Version Status Constraints
0 affected < 1.24.11
1.25.0 affected < 1.25.5

Configuration 1 [-]

OR cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Go Standard Library Subscribe
Crypto Tls Subscribe

Project Subscriptions

Vendors Products
Go Standard Library Subscribe
Crypto Tls Subscribe
Golang Subscribe
Go Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://go.dev/cl/723900 cve-icon cve-icon cve-icon
https://go.dev/issue/76442 cve-icon cve-icon cve-icon
https://groups.google.com/g/golang-announce/c/8FJoBkPddm4 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-61727 cve-icon
https://pkg.go.dev/vuln/GO-2025-4175 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-61727 cve-icon
History

Thu, 18 Dec 2025 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang go
CPEs cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
Vendors & Products Golang
Golang go

Wed, 17 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295
References
Metrics threat_severity

None

 threat_severity

Moderate

Thu, 04 Dec 2025 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library crypto Tls
Vendors & Products Go Standard Library
Go Standard Library crypto Tls

Wed, 03 Dec 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 03 Dec 2025 19:45:00 +0000

Type Values Removed Values Added
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.
Title Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509
References

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2025-12-03T22:06:17.007Z

Reserved: 2025-09-30T15:05:03.605Z

Link: CVE-2025-61727

cve-icon Vulnrichment

Updated: 2025-12-03T21:45:44.520Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-03T20:16:25.607

Modified: 2025-12-18T20:15:10.957

Link: CVE-2025-61727

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-12-03T19:37:15Z

Links: CVE-2025-61727 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-12-04T16:43:52Z

Weaknesses