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

- 種別: advisory
- 重大度: critical
- 関連技術: rust, wasmtime
- CVE: CVE-2026-115893
- 公開日時: 2026-10-28T21:14:14.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-mghf-wjfp-p5xm)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-mghf-wjfp-p5xm

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…