CVE-2026-47261

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In versions prior to 24.0.9, 36.0.10, and 44.0.2, when a filesystem preopen is given DirPerms::all() and FilePerms::READ without FilePerms::WRITE, this access control mechanism can be bypassed via the wasip2 descriptor.open-at or wasip1 path_open interfaces by opening a file with only the OpenFlags::TRUNCATE oflag. The root cause is that the clause handling OpenFlags::TRUNCATE in crates/wasi/src/filesystem.rs (Dir::open_at, lines 967\u2013969) did not set open_mode |= OpenMode::WRITE;, which is later used for the access control check against FilePerms to determine whether opening the file is permitted; the single-line fix adds that missing assignment, after which the affected calls correctly fail with error-code.not-permitted and ERRNO_PERM respectively. Only wasmtime-wasi embeddings that combine DirPerms::MUTATE with FilePerms::READ are affected by this bug. In particular, the Wasmtime project's wasmtime-cli's use of wasmtime-wasi is not affected, because it always sets FilePerms::all() for all preopens. This issue has been fixed in versions 24.0.9, 36.0.10 and44.0.2."}, {"lang": "es", "value": "Wasmtime es un entorno de ejecuci\u00f3n para WebAssembly. En versiones anteriores a la 24.0.9, 36.0.10 y 44.0.2, cuando a una preapertura del sistema de archivos se le otorgan DirPerms::all() y FilePerms::READ sin FilePerms::WRITE, este mecanismo de control de acceso puede ser eludido a trav\u00e9s de las interfaces wasip2 descriptor.open-at o wasip1 path_open abriendo un archivo con solo el indicador OpenFlags::TRUNCATE. La causa ra\u00edz es que la cl\u00e1usula que maneja OpenFlags::TRUNCATE en crates/wasi/src/filesystem.rs (Dir::open_at, l\u00edneas 967-969) no estableci\u00f3 open_mode |= OpenMode::WRITE;, lo cual se usa posteriormente para la verificaci\u00f3n de control de acceso contra FilePerms para determinar si se permite abrir el archivo; la correcci\u00f3n de una sola l\u00ednea a\u00f1ade esa asignaci\u00f3n faltante, despu\u00e9s de lo cual las llamadas afectadas fallan correctamente con error-code.not-permitted y ERRNO_PERM respectivamente. Solo las incrustaciones de wasmtime-wasi que combinan DirPerms::MUTATE con FilePerms::READ se ven afectadas por este error. En particular, el uso de wasmtime-wasi por parte de wasmtime-cli del proyecto Wasmtime no se ve afectado, porque siempre establece FilePerms::all() para todas las preaperturas. Este problema ha sido solucionado en las versiones 24.0.9, 36.0.10 y44.0.2."}], "id": "CVE-2026-47261", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47261", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-16T12:45:55.792446Z", "version": "2.0.3"}}]}, "published": "2026-06-15T21:17:11.153", "references": [{"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.9"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.10"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v44.0.2"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.0"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2r75-cxrj-cmph"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

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