CVE-2026-34983 | BDVDB-2026-326112 Detail

Description#

Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-04-09Record published in the CVE List.
2. Version 22026-04-13Most recent update recorded in the CVE List.