CVE Watch26 de out. de 2026

CVE-2026-115889

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

CVSS

9.9

Crítica

EPSS

0.5%

p40

KEV

—

Exploit Today

0-100

Publicado: 23 de out. de 2026 · Última mod.: 26 de out. de 2026 · CWE-197 · CWE-843

EPSS · 30d

0.5%EPSS · 30 dias0.5%

2026-10-252026-11-05

Descrição técnica

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.

Referências oficiais

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