{"id":"GO-2026-4866","revision":"a47cffaa6a754f8bb2449d959d8cda66","records":[{"revision":"a47cffaa6a754f8bb2449d959d8cda66","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4866","aliases":["BIT-golang-2026-33810","CVE-2026-33810"],"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.\n\nThis 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":"2026-04-07T22:53:49+00:00","modifiedAt":"2026-10-14T10:56:59.6453889+00:00","affected":[{"ecosystem":"Go","name":"stdlib","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.26.0-0"},{"kind":"fixed","version":"1.26.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://go.dev/cl/763763","https://go.dev/issue/78332","https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4866","license":"OSV · upstream source license applies","key":"osv:GO-2026-4866","identifiers":["GO-2026-4866","BIT-golang-2026-33810","CVE-2026-33810"]},"retained":false,"historicalAffected":[]}],"coverage":[]}