{"id":"GO-2026-5038","summary":"Quadratic complexity in WordDecoder.DecodeHeader in mime","details":"Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.","aliases":["BIT-golang-2026-42504","CVE-2026-42504"],"modified":"2026-09-18T10:41:38.257292439Z","published":"2026-06-02T21:39:47Z","related":["RHSA-2026:23262","RHSA-2026:23264","RHSA-2026:29980","RHSA-2026:29981","RHSA-2026:38995","RHSA-2026:49712","RHSA-2026:50319","RHSA-2026:50336","RHSA-2026:57361","RHSA-2026:57456","RHSA-2026:57482","RHSA-2026:57649","RHSA-2026:60018","RHSA-2026:61253","RHSA-2026:61882","RHSA-2026:62577","RHSA-2026:62631","RHSA-2026:63091","RHSA-2026:63119","RHSA-2026:63124","RHSA-2026:65116","RHSA-2026:65117","RHSA-2026:65153","RHSA-2026:65534","RHSA-2026:65886","RHSA-2026:65895","RHSA-2026:66327","RHSA-2026:66350","RHSA-2026:66375","RHSA-2026:67148","RHSA-2026:67159","RHSA-2026:67160","RHSA-2026:67974","RHSA-2026:67975","RHSA-2026:68334","RHSA-2026:68504","RHSA-2026:68527"],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-5038"},"references":[{"type":"REPORT","url":"https://go.dev/issue/79217"},{"type":"FIX","url":"https://go.dev/cl/774481"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"}],"affected":[{"package":{"name":"stdlib","ecosystem":"Go","purl":"pkg:golang/stdlib"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.11"},{"introduced":"1.26.0-0"},{"fixed":"1.26.4"}]}],"ecosystem_specific":{"imports":[{"path":"mime","symbols":["WordDecoder.DecodeHeader"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-5038.json"}}],"schema_version":"1.7.5","credits":[{"name":"p4p3r (https://hackerone.com/p4p3r_hak) "}]}