CVE-2026-33810
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:Apr 8, 2026
Last Modified:Sep 10, 2026
EPS:Apr 8, 2026
EPSS Score:0.0034
CVSS Score:7.5
Affected Products
Vendor
Product
Action
Vendor
Go Standard Library
Product
Crypto/x509
Go Standard Library
Crypto/x509
Vendor
Golang
Product
Go
Golang
Go
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
References
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
