WebAssembly wabt up to 1.0.39 wasm-decompile VarName out-of-bounds

Summaryinfo

A vulnerability, which was classified as critical, has been found in WebAssembly wabt up to 1.0.39. Impacted is the function wabt::Decompiler::VarName of the file /src/repro/wabt/bin/wasm-decompile of the component wasm-decompile. Performing a manipulation results in out-of-bounds. This vulnerability was named CVE-2025-15412. The attack needs to be approached locally. In addition, an exploit is available. 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.

Detailsinfo

A vulnerability was found in WebAssembly wabt up to 1.0.39. It has been classified as critical. This affects the function wabt::Decompiler::VarName of the file /src/repro/wabt/bin/wasm-decompile of the component wasm-decompile. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2025-15412. The exploitability is told to be easy. An attack has to be approached locally. Technical details and a public exploit are known.

The exploit is shared for download at github.com. It is declared as proof-of-concept. 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. The vulnerability scanner Nessus provides a plugin with the ID 281608 (Linux Distros Unpatched Vulnerability : CVE-2025-15412), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (281608) and EUVD (EUVD-2026-0003). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• WebAssembly

Name

• wabt

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19
• 1.0.20
• 1.0.21
• 1.0.22
• 1.0.23
• 1.0.24
• 1.0.25
• 1.0.26
• 1.0.27
• 1.0.28
• 1.0.29
• 1.0.30
• 1.0.31
• 1.0.32
• 1.0.33
• 1.0.34
• 1.0.35
• 1.0.36
• 1.0.37
• 1.0.38
• 1.0.39

Website

• Product: https://github.com/WebAssembly/wabt/

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Accepted

• Submit #719826: WebAssembly wabt 1.0.39 and master-branch Memory Corruption (by Oneafter)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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