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.
Published: 2025-12-03
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

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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

Subscriptions

Go Standard Library Crypto Tls
Golang Go
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