Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
CVE-2026-115893 is fixed in rust-wasmtime on 1 platform by DEBIAN-CVE-2026-115893 (version 36.0.20+dfsg-1), released November 3, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rust-wasmtime · Debian 14 | 36.0.20+dfsg-1 | DEBIAN-CVE-2026-115893 | Nov 3, 2026 |
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