---
id: CVE-2025-15412
title: A security vulnerability has been detected in WebAssembly wabt up to 1.0.39
summary: >-
  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 lead…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-119
  - CWE-125
vendor: webassembly
product: wabt
affected:
  - wabt <= 1.0.39
published: '2026-01-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T08:10:00.183'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-15412'
references:
  - url: 'https://github.com/WebAssembly/wabt/'
    label: cna@vuldb.com
  - url: 'https://github.com/WebAssembly/wabt/issues/2678'
    label: cna@vuldb.com
  - url: 'https://github.com/oneafter/1208/blob/main/af1'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?ctiid.339333'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?id.339333'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?submit.719826'
    label: cna@vuldb.com
tags:
  - nvd
epss: 0.00208
epssPercentile: 0.09823
ingestedAt: '2026-10-01T08:40:11.726Z'
---

## Overview

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.

## Affected

- `wabt <= 1.0.39`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.