# CVE-2025-15412: A security vulnerability has been detected in WebAssembly wabt up to 1.0.39. This issue affects the function…

Source: https://junglewise.ai/threats/cve-2025-15412-a-security-vulnerability-has-been-detected-in-webassembly-wabt-up  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-01  
License: CC BY 4.0 with a link back

CVE-2025-15412 · Severity: medium · CVSS 5.3 · Published 2026-01-01

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.

Technologies: [WebAssembly Wabt](https://junglewise.ai/threats/technologies/wabt). Vendors: [WebAssembly](https://junglewise.ai/threats/vendors/webassembly).

## Quick answers

**Is CVE-2025-15412 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-15412 being exploited in the wild.

**How severe is CVE-2025-15412?** Medium severity, with a CVSS score of 5.3, published 1 January 2026.

**Which products and versions are affected?** WebAssembly Wabt. The advisory does not name versions.

**Is there a fix for CVE-2025-15412?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-15412?** Check whether you run WebAssembly Wabt. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- WebAssembly Wabt

## Related threats

- [WebAssembly wabt wasm2c sandbox escape via table fli](https://junglewise.ai/threats/cve-2026-90648-webassembly-wabt-wasm2c-sandbox-escape-via-table-fli)
- [A weakness has been identified in WebAssembly wabt up to 1.0.39. This vulnerability affects the function…](https://junglewise.ai/threats/cve-2025-15411-a-weakness-has-been-identified-in-webassembly-wabt-up-to-1-0-39)