{"id":"CVE-2026-34944","revision":"d34272e1975b4c829e5a20f9267ad925","records":[{"revision":"d34272e1975b4c829e5a20f9267ad925","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-34944","aliases":[],"title":"Wasmtime segfault or unused out-of-sandbox load with `f64x2.splat` operator on x86-64","description":"Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.","state":0,"publishedAt":"2026-04-09T18:38:16.182+00:00","modifiedAt":"2026-04-13T15:38:40.634+00:00","affected":[{"ecosystem":"Vendor product","name":"wasmtime","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"bytecodealliance\",\n                    \"product\": \"wasmtime\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 24.0.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 25.0.0, < 36.0.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 37.0.0, < 42.0.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 43.0.0, < 44.0.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":4.1,"severity":"MEDIUM"}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-34944","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-34944","identifiers":["CVE-2026-34944"]},"retained":false,"historicalAffected":[]}],"coverage":[]}