CVE-2026-115893: Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
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.
References
- github.com/advisories/GHSA-mghf-wjfp-p5xm
- github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd
- github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618
- github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe
- github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa
- github.com/bytecodealliance/wasmtime/pull/14818
- github.com/bytecodealliance/wasmtime/pull/14819
- github.com/bytecodealliance/wasmtime/pull/14820
- github.com/bytecodealliance/wasmtime/pull/14826
- github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19
- github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7
- github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm
- nvd.nist.gov/vuln/detail/CVE-2026-115893
- rustsec.org/advisories/RUSTSEC-2026-0379.html
Code Behaviors & Features
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