{"id":"CLEANSTART-2026-JE84467","summary":"Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU","details":"Security vulnerability affects the nats-streaming package. Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.","modified":"2026-09-18T12:16:44.934574019Z","published":"2026-06-10T01:06:24.663418Z","withdrawn":"2026-09-18T11:59:01.768079Z","upstream":["CVE-2026-42504"],"database_specific":{},"references":[{"type":"ADVISORY","url":"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-JE84467.json"},{"type":"WEB","url":"https://osv.dev/vulnerability/CVE-2026-42504"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42504"}],"affected":[{"package":{"name":"nats-streaming","ecosystem":"CleanStart"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.25.6-r3"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-JE84467.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}