{"id":"CVE-2026-34983","revision":"636fb517f1ae4c86a60e77cf9638d832","records":[{"revision":"636fb517f1ae4c86a60e77cf9638d832","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-34983","aliases":[],"title":"Wasmtime has a use-after-free bug after cloning `wasmtime::Linker`","description":"Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.","state":0,"publishedAt":"2026-04-09T18:47:26.575+00:00","modifiedAt":"2026-04-13T15:38:33.779+00:00","affected":[{"ecosystem":"Vendor product","name":"wasmtime","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"bytecodealliance\",\n                    \"product\": \"wasmtime\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 43.0.0, < 43.0.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:P/AC:H/AT:P/PR:H/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","score":1,"severity":"LOW"}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hfr4-7c6c-48w2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-34983","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-34983","identifiers":["CVE-2026-34983"]},"retained":false,"historicalAffected":[]}],"coverage":[]}