{"id":"GO-2026-4947","summary":"Unexpected work during chain building in crypto/x509","details":"During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.","aliases":["CVE-2026-32280"],"modified":"2026-04-08T01:15:46.261080Z","published":"2026-04-07T22:53:49Z","database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-4947","review_status":"REVIEWED"},"references":[{"type":"FIX","url":"https://go.dev/cl/758320"},{"type":"REPORT","url":"https://go.dev/issue/78282"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"}],"affected":[{"package":{"name":"stdlib","ecosystem":"Go","purl":"pkg:golang/stdlib"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.9"},{"introduced":"1.26.0-0"},{"fixed":"1.26.2"}]}],"ecosystem_specific":{"imports":[{"symbols":["Certificate.Verify","Certificate.buildChains"],"path":"crypto/x509"}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4947.json"}}],"schema_version":"1.7.5","credits":[{"name":"Jakub Ciolek - https://ciolek.dev"}]}