{"schema_version":"1.3.1","id":"GO-2026-4599","modified":"2026-03-07T17:04:32Z","published":"2026-03-06T21:03:42Z","aliases":["CVE-2026-27137"],"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.","affected":[{"package":{"name":"stdlib","ecosystem":"Go"},"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"]}]}}],"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"}],"credits":[{"name":"Jakub Ciolek"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-4599","review_status":"REVIEWED"}}