CVE-2024-30266 Wasmtime vulnerable to panic when using a dropped extenref-typed element segment

What is CVE-2024-30266?

CVE-2024-30266 is a low-severity denial of service vulnerability in bytecodealliance wasmtime, published on 4 Apr 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

wasmtime is a runtime for WebAssembly. The 19.0.0 release of Wasmtime contains a regression introduced during its development which can lead to a guest WebAssembly module causing a panic in the host runtime. A valid WebAssembly module, when executed at runtime, may cause this panic. This vulnerability has been patched in version 19.0.1.

Weakness: CWE-843

Which versions are affected by CVE-2024-30266?

4 open source packages ship an affected version, including wasmtime. It affects 1 product.

Products include Bytecodealliance Wasmtime.

How do I fix CVE-2024-30266?

Upgrade wasmtime to 19.0.1 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-30266 being exploited?

There is no known exploitation of CVE-2024-30266 in the wild and no public exploit code.

Other vulnerabilities in bytecodealliance wasmtime

• CVE-2026-34971 Wasmtime miscompiled guest heap access enables sandbox escape on aarch64 Cranelift Critical 9.0
• CVE-2026-34987 Wasmtime with Winch compiler backend on aarch64 may allow a sandbox-escaping memory access Critical 9.0
• CVE-2022-39393 Wasmtime vulnerable to data leakage between instances in the pooling allocator High 8.6
• CVE-2022-24791 Use after free in Wasmtime High 8.1
• CVE-2026-47261 Wasmtime: WASI path_open(TRUNCATE) bypasses `FilePerms::WRITE` host restriction High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2024-30266, GHSA-75hq-h6g9-h4q5, PYSEC-2024-327, RUSTSEC-2024-0441, UBUNTU-CVE-2024-30266.