CVE-2025-15412 WebAssembly wabt wasm-decompile VarName out-of-bounds

Medium 4.8 Published 1 Jan 2026 Updated 23 Feb 2026

An out-of-bounds read in wabt's wasm-decompile tool allows local attackers to cause crashes or leak memory contents.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-15412?

CVE-2025-15412 is a medium-severity memory corruption vulnerability in WebAssembly wabt, published on 1 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A security vulnerability has been detected in WebAssembly wabt up to 1.0.39. This issue affects the function wabt::Decompiler::VarName of the file /src/repro/wabt/bin/wasm-decompile of the component wasm-decompile. Such manipulation leads to out-of-bounds read. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. Unfortunately, the project has no active maintainer at the moment. In a reply to the issue report somebody recommended to the researcher to provide a PR himself.

Weakness: CWE-125, CWE-119

Which versions are affected by CVE-2025-15412?

It affects 1 product.

Products include Webassembly Wabt.

How do I fix CVE-2025-15412?

No fix has been published for CVE-2025-15412 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-15412 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-15412 exists.

Sources

Also known as DEBIAN-CVE-2025-15412, GHSA-q9fv-9fr9-69p3, UBUNTU-CVE-2025-15412.