CVE-2021-39218 Out-of-bounds read/write and invalid free with `externref`s and GC safepoints in Wasmtime

Wasmtime is an open source runtime for WebAssembly & WASI. In Wasmtime from version 0.26.0 and before version 0.30.0 is affected by a memory unsoundness vulnerability. There was an invalid free and out-of-bounds read and write bug when running Wasm that uses externrefs in Wasmtime. To trigger thi...

CVE-2021-39218

Technical details about CVE-2021-39218 (affected Wasmtime versions 0.26.0–0.30.0, root cause, exploit paths, and fixes) are not provided in the supplied documents. Monitor for official disclosures and patches.

CVE-2021-39219 Wrong type for `Linker`-define functions when used across two `Engine`s

Wasmtime is an open source runtime for WebAssembly & WASI. Wasmtime before version 0.30.0 is affected by a type confusion vulnerability. As a Rust library the wasmtime crate clearly marks which functions are safe and which are unsafe, guaranteeing that if consumers never use unsafe then it should...

CVE-2021-39219

Technical details about CVE-2021-39219 are not publicly provided in the connected documents. Monitor for updates from official advisories; the supplied sources do not enumerate affected products/versions or fixes beyond the initial description.

CVE-2021-39216 Use after free passing `externref`s to Wasm in Wasmtime

Wasmtime is an open source runtime for WebAssembly & WASI. In Wasmtime from version 0.19.0 and before version 0.30.0 there was a use-after-free bug when passing externrefs from the host to guest Wasm content. To trigger the bug, you have to explicitly pass multiple externrefs from the host to a...

CVE-2021-39216

Wasmtime (pre-0.30.0) contains a use-after-free when passing multiple externref values from host to guest Wasm, potentially allowing a GC to reclaim the first externref and then reuse it after control returns to Wasm. Affected versions are 0.19.0–0.29.0; upgrading to Wasmtime 0.30.0 fixes the iss...