{"id":"EUVD-2026-37001","revision":"fee7844e1c39416c92970ecc94514b15","records":[{"revision":"fee7844e1c39416c92970ecc94514b15","observedAt":"2026-10-28T06:17:19.077+00:00","statement":{"source":"euvd","id":"EUVD-2026-37001","aliases":["CVE-2026-47261","GHSA-2r75-cxrj-cmph"],"title":"Wasmtime is a runtime for WebAssembly. 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 …","description":"Wasmtime is a runtime for WebAssembly. 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 967–969) 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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":null}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2r75-cxrj-cmph","https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.9","https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.10","https://github.com/bytecodealliance/wasmtime/releases/tag/v44.0.2","https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-37001","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 15, 2026, 7:47:40 PM","dateUpdated":"Jun 16, 2026, 12:46:04 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-37001","identifiers":["EUVD-2026-37001","CVE-2026-47261","GHSA-2r75-cxrj-cmph"]},"retained":false,"historicalAffected":[]}],"coverage":[]}