| Package | Affected versions | Patched versions |
|---|---|---|
| wasmtime | ≥ 25.0.0, < 36.0.7≥ 37.0.0, < 42.0.2≥ 43.0.0, < 43.0.1< 24.0.7 | 36.0.742.0.243.0.124.0.7 |
Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings into the Component Model's utf16 or latin1+utf16 encodings improperly verified the alignment of reallocated strings. This meant that unaligned pointers could be passed to the host for transcoding which would trigger a host panic. This panic is possible to trigger from malicious guests which transfer very specific strings across components with specific addresses. Host panics are considered a DoS vector in Wasmtime as the panic conditions are controlled by the guest in this situation. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
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