CVE-2025-14956 MEDIUM

CVE-2025-14956: WebAssembly Binaryen wasm-binary.cpp readExport heap-based overflow

Vendor Webassembly
Product Binaryen
Weakness CWE-122
Published December 19, 2025
Last update February 24, 2026

CVSS base score

4.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 19, 2025 CVE published
February 24, 2026 Record updated