{"id":"CVE-2025-64345","sourceIdentifier":"security-advisories@github.com","published":"2025-11-12T22:15:49.623","lastModified":"2026-10-18T20:10:00.110","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Wasmtime is a runtime for WebAssembly. Prior to version 38.0.4, 37.0.3, 36.0.3, and 24.0.5, Wasmtime's Rust embedder API contains an unsound interaction where a WebAssembly shared linear memory could be viewed as a type which provides safe access to the host (Rust) to the contents of the linear memory. This is not sound for shared linear memories, which could be modified in parallel, and this could lead to a data race in the host. Patch releases have been issued for all supported versions of Wasmtime, notably: 24.0.5, 36.0.3, 37.0.3, and 38.0.4. These releases reject creation of shared memories via `Memory::new` and shared memories are now excluded from core dumps. As a workaround, eembeddings affected by this issue should use `SharedMemory::new` instead of `Memory::new` to create shared memories. Affected embeddings should also disable core dumps if they are unable to upgrade. Note that core dumps are disabled by default but the wasm threads proposal (and shared memory) is enabled by default."},{"lang":"es","value":"Wasmtime es un entorno de ejecución para WebAssembly. Versiones anteriores a la 38.0.4, 37.0.3, 36.0.3 y 24.0.5, la API del incrustador Rust de Wasmtime contiene una interacción insegura donde una memoria lineal compartida de WebAssembly podría ser vista como un tipo que proporciona acceso seguro al host (Rust) a los contenidos de la memoria lineal. Esto no es seguro para memorias lineales compartidas, las cuales podrían ser modificadas en paralelo, y esto podría llevar a una condición de carrera de datos en el host. Se han emitido lanzamientos de parches para todas las versiones compatibles de Wasmtime, en particular: 24.0.5, 36.0.3, 37.0.3 y 38.0.4. Estas versiones rechazan la creación de memorias compartidas a través de 'Memory::new' y las memorias compartidas ahora están excluidas de los volcados de memoria. Como solución alternativa, las incrustaciones afectadas por este problema deberían usar 'SharedMemory::new' en lugar de 'Memory::new' para crear memorias compartidas. Las incrustaciones afectadas también deberían deshabilitar los volcados de memoria si no pueden actualizar. Tenga en cuenta que los volcados de memoria están deshabilitados por defecto, pero la propuesta de hilos wasm (y la memoria compartida) está habilitada por defecto."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"bytecodealliance","product":"wasmtime","versions":[{"version":">= 38.0.1, < 38.0.4","status":"affected"},{"version":">= 37.0.0, < 37.0.3","status":"affected"},{"version":">= 26.0.0, < 36.0.3","status":"affected"},{"version":"< 24.0.5","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N","baseScore":1.8,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"HIGH","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":0.3,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2025-11-12T21:40:25.293462Z","id":"CVE-2025-64345","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-362"}]}],"references":[{"url":"https://docs.rs/wasmtime/latest/wasmtime/struct.Memory.html#method.new","source":"security-advisories@github.com"},{"url":"https://docs.rs/wasmtime/latest/wasmtime/struct.SharedMemory.html#method.new","source":"security-advisories@github.com"},{"url":"https://docs.wasmtime.dev/stability-release.html","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/9ebb6934f00d58b92fb68ed0e0b16c0ae828ca10","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v38.0.4","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hc7m-r6v8-hg9q","source":"security-advisories@github.com"}]}