{"schema":"threatline.record/2","record":{"id":"CVE-2026-97031","aliases":[],"summary":"Reject malformed ECH outer extension references in crypto/tls","details":"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. We now reject these as malformed and curb the memory amplification vector as a result.","categories":["Unclassified"],"product":"crypto/tls","vendor":"Go standard library","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97031","source_modified_at":"2026-10-09T15:59:17.238Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"crypto/tls","vendor":"Go standard library","versions":[{"version":"0","lessThan":"1.26.9","status":"affected","versionType":"semver"},{"version":"1.27.0-0","lessThan":"1.27.2","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97031","source_modified_at":"2026-10-09T15:59:17.238Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"crypto/tls","ecosystem":null},"version":"1.26.9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97031","source_modified_at":"2026-10-09T15:59:17.238Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"crypto/tls","ecosystem":null},"version":"1.27.2","basis":"first unaffected version stated in the CVE record"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00394,"percentile":0.32444,"score_date":"2026-10-23"},"published_at":"2026-10-08T22:53:58.775Z","modified_at":"2026-10-09T15:59:17.238Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97031","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-09T15:59:17.238Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97031","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://go.dev/cl/847312"},{"source":"CVE List","url":"https://go.dev/issue/81855"},{"source":"CVE List","url":"https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"},{"source":"CVE List","url":"https://pkg.go.dev/vuln/GO-2026-6607"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-09T15:59:09.530145Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-09T15:59:17.238Z","content_hash":"f4313e1b8c48e722ab3ded8c8c44da2a52187a7e56acbd63a478cff57fee1a99"}}