{"schema":"threatline.record/2","record":{"id":"CVE-2026-103399","aliases":[],"summary":"Libsoup: soupserver: http/1 request smuggling via undrained expect: 100-continue body","details":"A flaw was found in SoupServer (libsoup). When an HTTP/1.x client sends a request with Expect: 100-continue and a request body, and SoupServer returns an early final (non-1xx) response before the body is read, the server neither drains the declared body bytes nor closes the connection. On a keep-alive connection, those leftover bytes are interpreted as a subsequent HTTP request. A remote, unauthenticated attacker can place a complete HTTP request in the body and cause SoupServer to process that smuggled request, leading to unintended request handling.","categories":["Operating systems"],"product":"Red Hat Enterprise Linux 10","vendor":"Red Hat","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103399","source_modified_at":"2026-09-30T19:11:12.971Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat","versions":[],"defaultStatus":"affected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103399","source_modified_at":"2026-09-30T19:11:12.971Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat","versions":[],"defaultStatus":"unknown"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103399","source_modified_at":"2026-09-30T19:11:12.971Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat","versions":[],"defaultStatus":"affected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103399","source_modified_at":"2026-09-30T19:11:12.971Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[],"defaultStatus":"affected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103399","source_modified_at":"2026-09-30T19:11:12.971Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[],"defaultStatus":"affected"}],"fixed_versions":[],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00245,"percentile":0.14908,"score_date":"2026-10-23"},"published_at":"2026-09-30T17:42:31.307Z","modified_at":"2026-09-30T19:11:12.971Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-103399","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T19:11:12.971Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103399","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://access.redhat.com/security/cve/CVE-2026-103399","tags":["vdb-entry","x_refsource_REDHAT"]},{"source":"CVE List","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543949","tags":["issue-tracking","x_refsource_REDHAT"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-09-30T19:10:59.353028Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-30T19:11:12.971Z","content_hash":"94ae70c67fb0c31af148e225a8bc9f227126b64b1e92fff4317d8b5419f99ed4"}}