CVE-2026-115889
CRITICAL(9.9)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CVSS 9.9 — Kritisch
Erwähnungen (letzte 60 Tage)
EPSS-Score
0.5%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
9.9
Technische Schwere
Beschreibung
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.
GitHub Advisories
Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
Referenzen
- https://github.com/bytecodealliance/wasmtime/commit/ba8f7d70caa1825b7f64fa75cd9d...
- https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8c...
- https://github.com/bytecodealliance/wasmtime/pull/12613
- https://github.com/bytecodealliance/wasmtime/pull/14818
- https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19
- https://github.com/bytecodealliance/wasmtime/releases/tag/v43.0.0
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-...