{"id":"GO-2026-6607","aliases":["BIT-golang-2026-97031","CVE-2026-97031"],"title":"Reject malformed ECH outer extension references in crypto/tls","titleSource":"OSV","descriptionSource":"OSV","description":"Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references.\n\nWe now reject these as malformed and curb the memory amplification vector as a result.","severity":"unknown","score":null,"published":"2026-10-08T22:31:09.000Z","modified":"2026-11-14T13:12:13.844Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-6607","url":"https://osv.dev/vulnerability/GO-2026-6607"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.26.9"},{"introduced":"1.27.0-0"},{"fixed":"1.27.2"}],"type":"SEMVER"}],"versions":[],"fixed":["1.26.9","1.27.2"]}],"sourceAffected":[],"references":["https://go.dev/cl/847312","https://go.dev/issue/81855","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"],"sources":[{"name":"OSV","id":"GO-2026-6607","modified":"2026-11-14T13:12:13.844440303Z","url":"https://osv.dev/vulnerability/GO-2026-6607"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:04:57.662Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:10:31.937Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-14T00:40:55.330Z","attemptedAt":"2026-11-14T00:40:55.330Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T00:35:31.491Z","attemptedAt":"2026-11-14T00:35:31.491Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T00:35:32.511Z","attemptedAt":"2026-11-14T00:35:32.511Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T00:35:32.511Z","attemptedAt":"2026-11-14T00:35:32.511Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-hq7w-2xrq-wp2j","url":"https://github.com/advisories/GHSA-hq7w-2xrq-wp2j","modified":"2026-10-09T18:31:37Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T00:35:31.491Z"},{"source":"FIRST EPSS","id":"CVE-2026-97031","url":"https://www.first.org/epss/","probability":0.00716,"percentile":0.54302,"date":"2026-11-13","checkedAt":"2026-11-14T00:35:32.511Z"},{"source":"ENISA EUVD","id":"EUVD-2026-95422","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95422","modified":"Oct 9, 2026, 3:59:17 PM","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T00:35:32.511Z"},{"source":"NVD","id":"CVE-2026-97031","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97031","modified":"2026-10-09T16:35:35.900","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T00:40:55.330Z"}],"aiSummary":null}