Null Pointer Dereference Vulnerability in WebAssembly Binaryen by WebAssembly
CVE-2025-14957

4.8MEDIUM

Key Information:

Vendor

Webassembly

Status
Binaryen
Vendor
CVE Published:
19 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-14957?

A vulnerability has been discovered in the WebAssembly Binaryen that allows for a null pointer dereference due to improper handling of the arguments within the IRBuilder components. Specifically, the functions IRBuilder::makeLocalGet, IRBuilder::makeLocalSet, and IRBuilder::makeLocalTee can be affected when they receive manipulated index values. This vulnerability necessitates local access to exploit, and there is an available exploit that can be leveraged. To mitigate the risk posed by this vulnerability, it is highly recommended to apply the patch identified as 6fb2b917a79578ab44cf3b900a6da4c27251e0d4.

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-2025-14957 - Proof of Concept

References

https://vuldb.com/?id.337593
vdb-entrytechnical-description
https://vuldb.com/?ctiid.337593
signaturepermissions-required
https://vuldb.com/?submit.717317
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
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-2025-14957 : Null Pointer Dereference Vulnerability in WebAssembly Binaryen by WebAssembly