{"id":"CVE-2026-5067","revision":"c2e51c26b5554a37a800a86030deba02","records":[{"revision":"c2e51c26b5554a37a800a86030deba02","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-5067","aliases":[],"title":"Out-of-bounds read/write in HTTP WebSocket upgrade via non-null-terminated Sec-WebSocket-Key","description":"A remote, unauthenticated attacker can trigger memory corruption in Zephyr's HTTP server WebSocket upgrade path by sending a crafted Sec-WebSocket-Key header. The HTTP/1 header parser copies the header into a fixed-size buffer using a bounded copy that does not guarantee NUL termination when the input length reaches the buffer size. During upgrade handling the buffer is copied to a local stack buffer and passed to strlen(); if no NUL exists in-bounds, strlen() reads beyond the stack buffer and subsequent concatenation with the WebSocket magic string can write out of bounds. This leads to out-of-bounds read and write on stack memory, resulting in crash (denial of service) and potentially code execution. The path is reachable when CONFIG_HTTP_SERVER_WEBSOCKET is enabled.","state":0,"publishedAt":"2026-06-09T06:01:02.559+00:00","modifiedAt":"2026-10-15T22:10:25.382+00:00","affected":[{"ecosystem":"Vendor product","name":"Zephyr","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageName\": \"Zephyr\",\n                    \"product\": \"Zephyr\",\n                    \"repo\": \"https://github.com/zephyrproject-rtos/zephyr\",\n                    \"vendor\": \"zephyrproject-rtos\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"4.3.1\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.7.0\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-wgr4-9pwq-94vj"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-5067","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-5067","identifiers":["CVE-2026-5067"]},"retained":false,"historicalAffected":[]}],"coverage":[]}