{"schema":"threatline.record/2","record":{"id":"CVE-2026-115723","aliases":[],"summary":"Snap7 through 1.4.3 Out-of-Bounds Write via BRecv and CheckAsBRecvCompletion","details":"Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers by declaring an unvalidated BSend total length. Attackers connecting from the configured peer address can declare up to 65535 bytes and send a short fragment, causing BRecv to memcpy past the buffer and crash or corrupt SCADA, HMI or gateway processes.","categories":["Unclassified"],"product":"snap7","vendor":"davenardella","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115723","source_modified_at":"2026-10-23T14:59:52.690Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"snap7","vendor":"davenardella","versions":[{"lessThanOrEqual":"1.4.3","status":"affected","version":"0","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.3,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00617,"percentile":0.48957,"score_date":"2026-10-24"},"published_at":"2026-10-23T11:36:47.011Z","modified_at":"2026-10-23T14:59:52.690Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-115723","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T14:59:52.690Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-115723","fetched_at":"2026-10-24T18:03:20.872036Z","source_modified_at":"2026-10-24"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/davenardella/snap7/pull/41","tags":["issue-tracking","patch"]},{"source":"CVE List","url":"https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_partner.cpp#L1126-L1166","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_partner.cpp#L850-L867","tags":["technical-description"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-brecv-and-checkasbrecvcompletion","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-23T14:48:43.225515Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-23T14:59:52.690Z","content_hash":"91288c87d24e438b5247b8ca54dbd69c5460d8c6a494cc0664bd573ef503acda"}}