CVE-2026-34987
CriticalSummary
Wasmtime to środowisko uruchomieniowe dla WebAssembly. W wersjach od 25.0.0 do przed 36.0.7, 42.0.2 i 43.0.1, Wasmtime z kompilatorem Winch może pozwolić na dostęp do pamięci hosta poza piaskownicą pamięci liniowej, jeśli użyty zostanie kompilator Winch.
Risk Assessment
Ta podatność może umożliwić złośliwemu kodowi w Wasm dostęp do pamięci hosta, co może prowadzić do poważnych naruszeń bezpieczeństwa i wycieku danych. Ryzyko jest szczególnie wysokie w przypadku zastosowania kompilatora Winch.
Recommendation
Zaleca się unikanie używania kompilatora Winch w Wasmtime oraz aktualizację do najnowszej wersji, aby zminimalizować ryzyko związane z tą podatnością.
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Original NVD description (English source)
Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime with its Winch (baseline) non-default compiler backend may allow properly constructed guest Wasm to access host memory outside of its linear-memory sandbox. This vulnerability requires use of the Winch compiler (-Ccompiler=winch). By default, Wasmtime uses its Cranelift backend, not Winch. With Winch, the same incorrect assumption is present in theory on both aarch64 and x86-64. The aarch64 case has an observed-working proof of concept, while the x86-64 case is theoretical and may not be reachable in practice. This Winch compiler bug can allow the Wasm guest to access memory before or after the linear-memory region, independently of whether pre- or post-guard regions are configured. The accessible range in the initial bug proof-of-concept is up to 32KiB before the start of memory, or ~4GiB after the start of memory, independently of the size of pre- or post-guard regions or the use of expl
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

