CVE-2025-14956

WebAssembly Binaryen wasm-binary.cpp readExport heap-based overflow

State: Published
Severity: 4.8 Medium
Published: Dec 19, 2025
Updated: Feb 24, 2026
Reserved: 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.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	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	VulDB
3.1	5.3 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
3.0	5.3 Medium	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
2.0	4.3 Medium	AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-122 Heap-based Buffer Overflow
CWE-119 Memory Corruption

Affected Products

Product	Versions
BinaryenWebAssembly	125Affected

References

VDB-337592 | WebAssembly Binaryen wasm-binary.cpp readExport heap-based overflowvdb-entrytechnical-description
VDB-337592 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #717315 | WebAssembly binaryen 9a226ac Heap-based Buffer Overflowthird-party-advisory
https://github.com/WebAssembly/binaryen/issues/8089issue-tracking
https://github.com/WebAssembly/binaryen/pull/8092issue-tracking
https://github.com/oneafter/1204/blob/main/hbfexploit
https://github.com/WebAssembly/binaryen/commit/4f52bff8c4075b5630422f902dd92a0af2c9f398patch
https://github.com/WebAssembly/binaryen/product

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