# CVE-2025-14956: binaryen: A vulnerability was determined in WebAssembly Binaryen up to 125

CVE-2025-14956 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2025-14956, released December 19, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-14956
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 19, 2025

## Description

A vulnerability was determined in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Patch name: 4f52bff8c4075b5630422f902dd92a0af2c9f398. It is recommended to apply a patch to fix this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | binaryen Debian 14 | 130-2 | [DEBIAN-CVE-2025-14956](https://patchblox.com/security/data/fix/linux/debian-cve-2025-14956.md) | Dec 19, 2025 |
| Linux | binaryen Fedora 43 | 126-1.fc43 | [FEDORA-2026-FB3E461878](https://patchblox.com/security/data/fix/linux/fedora-2026-fb3e461878.md) | Apr 20, 2026 |
| Linux | binaryen-debuginfo Fedora 43 | 126-1.fc43 | [FEDORA-2026-FB3E461878](https://patchblox.com/security/data/fix/linux/fedora-2026-fb3e461878.md) | Apr 20, 2026 |
| Linux | binaryen-debugsource Fedora 43 | 126-1.fc43 | [FEDORA-2026-FB3E461878](https://patchblox.com/security/data/fix/linux/fedora-2026-fb3e461878.md) | Apr 20, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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