{"id":"CVE-2026-115723","revision":"30e3d9ee451746ec8dfdb1d57b0cc2cc","records":[{"revision":"30e3d9ee451746ec8dfdb1d57b0cc2cc","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-115723","aliases":[],"title":"Snap7 through 1.4.3 Out-of-Bounds Write via BRecv and CheckAsBRecvCompletion","description":"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.","state":0,"publishedAt":"2026-10-23T11:36:47.011+00:00","modifiedAt":"2026-10-23T11:36:47.011+00:00","affected":[{"ecosystem":"Vendor product","name":"snap7","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"davenardella\",\n                    \"product\": \"snap7\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"1.4.3\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:github/davenardella/snap7\",\n                    \"repo\": \"https://github.com/davenardella/snap7\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.3,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","score":7.4,"severity":"HIGH"}],"references":["https://github.com/davenardella/snap7/pull/41","https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_partner.cpp#L1126-L1166","https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_partner.cpp#L850-L867","https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-brecv-and-checkasbrecvcompletion"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115723","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115723","identifiers":["CVE-2026-115723"]},"retained":false,"historicalAffected":[]}],"coverage":[]}