{"id":"GO-2026-4599","summary":"Incorrect enforcement of email constraints in crypto/x509","details":"When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.","aliases":["BIT-golang-2026-27137","CVE-2026-27137"],"modified":"2026-04-24T10:29:06.640673160Z","published":"2026-03-06T21:03:42Z","related":["CGA-rq3j-hw6w-7wc2","RHSA-2026:10169","RHSA-2026:8842"],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-4599"},"references":[{"type":"FIX","url":"https://go.dev/cl/752182"},{"type":"REPORT","url":"https://go.dev/issue/77952"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk"}],"affected":[{"package":{"name":"stdlib","ecosystem":"Go","purl":"pkg:golang/stdlib"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.26.0-0"},{"fixed":"1.26.1"}]}],"ecosystem_specific":{"imports":[{"path":"crypto/x509","symbols":["Certificate.Verify","checkChainConstraints","checkConstraints","emailConstraints.query","newEmailConstraints","parseMailboxes"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4599.json"}}],"schema_version":"1.7.5","credits":[{"name":"Jakub Ciolek"}]}