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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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.
Metrics
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[{"vendor":"Go standard library","product":"crypto/x509","defaultStatus":"unaffected","collectionURL":"https://pkg.go.dev","packageName":"crypto/x509","programRoutines":[{"name":"newDNSConstraints"},{"name":"dnsConstraints.query"},{"name":"Certificate.Verify"}],"versions":[{"version":"1.26.0-0","lessThan":"1.26.2","versionType":"semver","status":"affected"}]}]
OR
*cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.26.0 up to (excluding) 1.26.2
Added
Reference Type
Go Project: https://go.dev/cl/763763 Types: Patch
Added
Reference Type
Go Project: https://go.dev/issue/78332 Types: Issue Tracking
Added
Reference Type
Go Project: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU Types: Mailing List, Release Notes
Added
Reference Type
Go Project: https://pkg.go.dev/vuln/GO-2026-4866 Types: Vendor Advisory
CVE Modified by CISA-ADP4/13/2026 3:16:42 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
New CVE Received from Go Project4/07/2026 10:16:03 PM
Action
Type
Old Value
New Value
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.
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