CVE-2025-64704 WebAssembly Micro Runtime vulnerable to a segmentation fault in v128.store instruction

Medium 4.7 Published 25 Nov 2025 Updated 26 Nov 2025

A segmentation fault in the v128.store instruction allows attackers to crash the WebAssembly Micro Runtime, causing denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-64704?

CVE-2025-64704 is a medium-severity denial of service vulnerability in bytecodealliance wasm-micro-runtime, published on 25 Nov 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to version 2.4.4, WAMR is susceptible to a segmentation fault in v128.store instruction. This issue has been patched in version 2.4.4.

Weakness: CWE-754

Which versions are affected by CVE-2025-64704?

It affects 1 product.

Products include Bytecodealliance Webassembly Micro Runtime.

How do I fix CVE-2025-64704?

No fix has been published for CVE-2025-64704 yet. Limit exposure of the affected software until one is available.

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-2025-64704 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-64704 exists.

Sources

Also known as GHSA-2f2p-wf5w-82qr.