Use After Free in Bytecodealliance Wasmtime

CVE-2026-34983

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…

Vulnerability class: Use-After-Free

EPSS: 0.000 (0.3th percentile) — read the EPSS interpretation.

Affected products

Bytecodealliance Wasmtime — versions >= 43.0.0, < 43.0.1

Weakness classification (CWE)

CWE-416 — Use After Free

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hfr4-7c6c-48w2 (x_refsource_CONFIRM)