Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
影響: rust:wasmtime < 36.0.19 → 36.0.19, rust:wasmtime >= 37.0.0, < 43.0.0 → 43.0.0
In Wasmtime prior to v43, the Cranelift compiler backend bit-packs its SSA value indices in a way that can result in silent overflow in release builds, and result in incorrect value references in the IR resulting in arbitrary miscompilation. A very large Wasm function body, or one that is specially crafted to use many SSA values, can use this to force type-confusion or other arbitrary side-effects and escape the sandbox. Cranelift was changed in Wasmtime v43 to use a full u32 index, with checks…
| CVE | CVE-2026-115889 |
|---|---|
| 정보원 | GitHub Advisory Database |
| 수집 시각 | 2026. 10. 24. 오후 01:50 |
| 데이터 | Markdown JSON |
2026. 10. 24. 오전 07:02, GitHub Advisory Database에서 "Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation"을(를) 게시했습니다 (유형: 취약점 권고). 심각도는 "긴급"(critical)입니다. 관련 기술: Rust, Wasmtime / Wasmer. CVE: CVE-2026-115889.