Heap-based Buffer Overflow in WebAssembly Binaryen Affects Multiple Versions
CVE-2025-14956

4.8MEDIUM

Key Information:

Vendor

Webassembly

Status
Binaryen
Vendor
CVE Published:
19 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-14956?

A vulnerability exists in WebAssembly Binaryen, specifically within the WasmBinaryReader::readExport function of the wasm-binary.cpp file. This issue can lead to a heap-based buffer overflow, which may allow an attacker to execute malicious code on the local host. This vulnerability has been publicly disclosed, making it a potential target for exploitation. A patch has been released to address this issue, and it is strongly advised to apply the provided patch to mitigate the risks associated with this vulnerability.

Affected Version(s)

Binaryen 125

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-14956 - Proof of Concept

References

https://vuldb.com/?id.337592
vdb-entrytechnical-description
https://vuldb.com/?ctiid.337592
signaturepermissions-required
https://vuldb.com/?submit.717315
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Oneafter (VulDB User)
JSON
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CVE-2025-14956 : Heap-based Buffer Overflow in WebAssembly Binaryen Affects Multiple Versions