{"id":"CVE-2026-33810","revision":"b6efdf4674654dd584edb7cb4ed97873","records":[{"revision":"b6efdf4674654dd584edb7cb4ed97873","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33810","aliases":[],"title":"Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509","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.","state":0,"publishedAt":"2026-04-08T01:06:56.546+00:00","modifiedAt":"2026-09-18T12:04:39.388+00:00","affected":[{"ecosystem":"https://pkg.go.dev","name":"crypto/x509","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Go standard library\",\n                    \"product\": \"crypto/x509\",\n                    \"collectionURL\": \"https://pkg.go.dev\",\n                    \"packageName\": \"crypto/x509\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.26.0-0\",\n                            \"lessThan\": \"1.26.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"newDNSConstraints\"\n                        },\n                        {\n                            \"name\": \"dnsConstraints.query\"\n                        },\n                        {\n                            \"name\": \"Certificate.Verify\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://go.dev/cl/763763","https://go.dev/issue/78332","https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU","https://pkg.go.dev/vuln/GO-2026-4866"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-33810","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-33810","identifiers":["CVE-2026-33810"]},"retained":false,"historicalAffected":[]}],"coverage":[]}