Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction

影響: rust:wasmtime < 36.0.19 → 36.0.19, rust:wasmtime >= 37.0.0, < 48.0.7 → 48.0.7, rust:wasmtime >= 49.0.0, < 49.0.4 → 49.0.4

When running with the Cranelift compiler backend on an aarch64 target, Wasmtime can compile a Wasm module with more than ~256k targets on one br_table instruction in a way that results in an incorrect conditional branch target. This conditional branch could then jump to arbitrary other code (at an user-controlled offset), leading to arbitrary sandbox escapes. Impact Any Wasmtime engine running on aarch64 with default settings can be forced to jump to arbitrary code by a user-controlled Wasm mod…

Read on GitHub Advisory Database

On 10/29/2026, 06:14 AM, GitHub Advisory Database published "Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction" (type: Advisory). Severity is "Critical" (critical). Related technologies: Rust, Wasmtime / Wasmer. CVE: CVE-2026-115893.