CVE-2025-64345

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{"affected": [{"affectedData": [{"product": "wasmtime", "vendor": "bytecodealliance", "versions": [{"status": "affected", "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"}]}], "source": "security-advisories@github.com"}], "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 ejecuci\u00f3n 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 interacci\u00f3n insegura donde una memoria lineal compartida de WebAssembly podr\u00eda 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 podr\u00edan ser modificadas en paralelo, y esto podr\u00eda llevar a una condici\u00f3n 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 creaci\u00f3n de memorias compartidas a trav\u00e9s de 'Memory::new' y las memorias compartidas ahora est\u00e1n excluidas de los volcados de memoria. Como soluci\u00f3n alternativa, las incrustaciones afectadas por este problema deber\u00edan usar 'SharedMemory::new' en lugar de 'Memory::new' para crear memorias compartidas. Las incrustaciones afectadas tambi\u00e9n deber\u00edan deshabilitar los volcados de memoria si no pueden actualizar. Tenga en cuenta que los volcados de memoria est\u00e1n deshabilitados por defecto, pero la propuesta de hilos wasm (y la memoria compartida) est\u00e1 habilitada por defecto."}], "id": "CVE-2025-64345", "lastModified": "2026-10-18T20:10:00.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 1.8, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 0.3, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-64345", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-11-12T21:40:25.293462Z", "version": "2.0.3"}}]}, "published": "2025-11-12T22:15:49.623", "references": [{"source": "security-advisories@github.com", "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"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "wasmtime: Wasmtime unsound API access to shared linear memory", "id": "2414696", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414696"}, "csaw": false, "cvss3": {"cvss3_base_score": "1.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-362", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-64345", "package_state": [{"cpe": "cpe:/a:redhat:connectivity_link:1", "fix_state": "Fix deferred", "package_name": "rhcl-1/wasm-shim-rhel9", "product_name": "Red Hat Connectivity Link 1"}], "public_date": "2025-11-12T21:25:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-64345\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-64345\nhttps://docs.rs/wasmtime/latest/wasmtime/struct.Memory.html#method.new\nhttps://docs.rs/wasmtime/latest/wasmtime/struct.SharedMemory.html#method.new\nhttps://docs.wasmtime.dev/stability-release.html\nhttps://github.com/bytecodealliance/wasmtime/commit/9ebb6934f00d58b92fb68ed0e0b16c0ae828ca10\nhttps://github.com/bytecodealliance/wasmtime/releases/tag/v38.0.4\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hc7m-r6v8-hg9q"], "threat_severity": "Low"}

{"created": "2025-11-13T09:52:22.798651+00:00", "updated": "2025-11-13T09:52:22.798677+00:00", "vendors": ["bytecodealliance", "bytecodealliance$PRODUCT$wasmtime"]}