CVE-2022-31169

CVE-2022-31169 affects Wasmtime’s Cranelift codegen on AArch64. A miscompilation in constant division may place incorrect values in registers due to sign/zero-extension rules, impacting WebAssembly sandbox correctness. Affected: Wasmtime prior to 0.38.2 and Cranelift prior to 0.85.2; fixed in Was...

CVE-2022-39392

CVE-2022-39392 affects Wasmtime’s pooling instance allocator when InstanceLimits::memory_pages is set to zero. In this configuration, the virtual memory mapping for WebAssembly memories can fail to meet safety requirements, allowing out-of-bounds reads/writes to access memory outside the wasm san...

CVE-2026-44216

Wasmtime (WebAssembly runtime) contains a vulnerability in its allocation logic for WebAssembly tables: checked arithmetic may panic on overflow when allocating extremely large tables (possible with memory64). Affects Wasmtime versions 30.0.0–36.0.8, 43.0.2, and 44.0.1. The panic occurs during cr...

CVE-2026-34943

Wasmtime (WebAssembly runtime) has a vulnerability where lifting a flags-typed component-model value with Val can panic if bits outside the allowed flags set are present. Affected versions before fixes include 24.0.7, 36.0.7, 42.0.2, and 43.0.1; the panic occurs in Wasmtime’s Val lifting (not in ...

CVE-2026-27572

Wasmtime (WebAssembly runtime) is affected by CVE-2026-27572 in the wasi:http/types.fields implementation. Prior to patched releases (Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0), the wasmtime-wasi-http crate uses a data structure that panics when the headers field set becomes excessively...

CVE-2026-47261

CVE-2026-47261 : Wasmtime-wasi WASI path_open(TRUNCATE) bypasses FilePerms::WRITE host restriction. Root cause: when OpenFlags::TRUNCATE is used, open_mode was not OR-ed with WRITE, allowing a READ-only preopen with DirPerms::all() to bypass access checks via wasip1 path_open or wasip2 descriptor...

CVE-2026-34946

Summary: Wasmtime’s Winch-based code path can panic the host when compiling the WebAssembly table.fill instruction. From 25.0.0 up to but not including 36.0.7, 42.0.2, and 43.0.1, a historical refactor changed how compiled code references table elements, but Winch paths were not updated, leading ...

CVE-2026-27195

CVE-2026-27195 affects Wasmtime in versions where component-model-async is default (from 39.0.0). The bug causes a panic when a host embeds calls to wasmtime::component::[Typed]Func::call_async, drops the returned Future after polling, and then reuses the same component instance before the first ...

CVE-2026-35186

Wasmtime vulnerable due to a Winch backend bug in table.grow (affecting 32-bit tables) that could mis-interpret the result and allow reads/writes to the 16 bytes before linear memory, causing DoS and potential host-data leakage. Affected versions: Wasmtime 25.0.0 up to before 36.0.7, 42.0.2, and ...