CVE-2026-47261
HIGHCVSS v3.1: 7.5 · EPSS: 0.0053 (40.6 パーセンタイル)
出典データ取得時点:
概要
- 深刻度
- HIGH
- CVSS
- 7.5 v3.1 · NVD
- EPSS
- 0.0053 (40.6 パーセンタイル) · FIRST.org
- CISA KEV
- 非該当
- 攻撃条件（CVSSベクター）
- ネットワーク権限不要操作不要 · 出典: NVD ベクター
- 公開日
- 2026-06-15 · 更新日: 2026-06-16
- 参照情報
- 参照情報へ移動 (5)
CVSS / EPSS / KEV
出典 — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. データと出典
説明
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.
参照情報
NVDが列挙した参照URLを、リンクのホスト・パターンに対する機械的な一致でグループ化したもの。ラベルはリンクの種別のみを示します。
- パッチ https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.9
- パッチ https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.10
- パッチ https://github.com/bytecodealliance/wasmtime/releases/tag/v44.0.2
- パッチ https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.0
- ベンダー勧告 https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2r75-cxrj-cmph