Description
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-115889 ↗
- github.com/bytecodealliance/wasmtime/commit/ba8f7d70caa1825b7f64fa75cd9d03f4a438dae0 ↗
- github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa ↗
- github.com/bytecodealliance/wasmtime/pull/12613 ↗
- github.com/bytecodealliance/wasmtime/pull/14818 ↗
- github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19 ↗
- github.com/bytecodealliance/wasmtime/releases/tag/v43.0.0 ↗
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.