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CVE-2025-14956

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

Published: Dec 19, 2025Updated: Apr 29, 2026 Sources: CVE List NVDCWE-119
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 92.2%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-119CWE-122CWE-125

Affected Products

binaryenwebassembly
Library
OSS Libraries / generic-library
BinaryenWebAssembly
Library
OSS Libraries / generic-library
webassemblyoss-projectOSS Librariesaka webassembly

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

3 techniques
Collection
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/WebAssembly/binaryen/
github.com
https://github.com/WebAssembly/binaryen/commit/4f52bff8c4075b5630422f902dd92a0af2c9f398
github.com
https://github.com/WebAssembly/binaryen/issues/8089
github.com
and 5 more references View all →

Timeline

Published
Dec 19, 2025
Last Updated
Apr 29, 2026

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