CVE-2022-23636

CVE-2022-23636 affects Wasmtime prior to 0.34.1 and 0.33.1, due to a bug in the pooling instance allocator that can cause an invalid drop of a VMExternRef when a module defines an externref global and instance creation fails. The vulnerability depends on specific conditions (e.g., mprotect/Virtua...

CVE-2022-31146

CVE-2022-31146 affects Wasmtime (Cranelift) in the migration to the regalloc2 allocator (Wasmtime 0.37.0). The bug may cause metadata for reference-typed functions to be missing during GC, making the GC pass think there are no live references, leading to use-after-free when values are later acces...

CVE-2022-39393

Wasmtime vulnerability CVE-2022-39393: prior to versions 2.0.2 and 1.0.2, a bug in the pooling instance allocator can cause the initial heap snapshot of a prior instance to be visible to the next instance when reusing linear memory. This data leakage between instances can lead to information expo...

CVE-2023-30624

Wasmtime CVE-2023-30624 concerns an LLVM-level undefined behavior in per-instance state management (VMContext) of the Wasmtime runtime. The issue occurs in Wasmtime versions prior to 6.0.2, 7.0.1, and 8.0.1 and arises when unsafe code mutates VMContext data via methods using &self, which can lead...

CVE-2026-34941

Wasmtime (WebAssembly runtime) contains a heap OOB read during transcoding of UTF-16 to the latin1+utf16 component-model encoding. The bug stems from validating the input length by code units instead of by byte length, causing reads beyond the WebAssembly linear memory during bounds checking. In ...