Description
When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Published: 2026-04-08
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Authentication Bypass
Action: Apply Patch
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Remediation

No vendor fix or workaround currently provided.

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History

Mon, 20 Apr 2026 18:30:00 +0000

Type Values Removed Values Added
References

Sun, 19 Apr 2026 23:30:00 +0000

Type Values Removed Values Added
References

Fri, 17 Apr 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang go
Weaknesses CWE-295
CPEs cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
Vendors & Products Golang
Golang go

Tue, 14 Apr 2026 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295

Tue, 14 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1289
References
Metrics threat_severity

None

threat_severity

Important


Mon, 13 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

ssvc

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


Thu, 09 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library crypto/x509
Vendors & Products Go Standard Library
Go Standard Library crypto/x509

Wed, 08 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295

Wed, 08 Apr 2026 01:45:00 +0000

Type Values Removed Values Added
Description When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Title Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
References

Subscriptions

Go Standard Library Crypto/x509
Golang Go
cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-04-20T17:23:21.823Z

Reserved: 2026-03-23T20:35:32.814Z

Link: CVE-2026-33810

cve-icon Vulnrichment

Updated: 2026-04-19T22:08:53.727Z

cve-icon NVD

Status : Modified

Published: 2026-04-08T02:16:03.950

Modified: 2026-04-20T18:16:26.813

Link: CVE-2026-33810

cve-icon Redhat

Severity : Important

Publid Date: 2026-04-08T01:06:56Z

Links: CVE-2026-33810 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-18T17:30:05Z

Weaknesses