{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33810", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-03-23T20:35:32.814Z", "datePublished": "2026-04-08T01:06:56.546Z", "dateUpdated": "2026-04-08T01:06:56.546Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-04-08T01:06:56.546Z"}, "title": "Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509", "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "Go standard library", "product": "crypto/x509", "collectionURL": "https://pkg.go.dev", "packageName": "crypto/x509", "versions": [{"version": "1.26.0-0", "lessThan": "1.26.2", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "newDNSConstraints"}, {"name": "dnsConstraints.query"}, {"name": "Certificate.Verify"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-295: Improper Certificate Validation"}]}], "references": [{"url": "https://go.dev/cl/763763"}, {"url": "https://go.dev/issue/78332"}, {"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4866"}], "credits": [{"lang": "en", "value": "Riyas from Saintgits College of Engineering"}, {"lang": "en", "value": "k1rnt"}, {"lang": "en", "value": "@1seal"}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-33810", "lastModified": "2026-04-08T02:16:03.950", "metrics": {}, "published": "2026-04-08T02:16:03.950", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/763763"}, {"source": "security@golang.org", "url": "https://go.dev/issue/78332"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-4866"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Received"}

{}

{}