Null Pointer Dereference in Wren by Wren-lang
CVE-2026-3387

4.8MEDIUM

Key Information:

Vendor

Wren-lang

Status
Wren
Vendor
CVE Published:
1 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3387?

A vulnerability exists in Wren, specifically in the 'getByteCountForArguments' function located in 'src/vm/wren_compiler.c'. This flaw can lead to a null pointer dereference, allowing an attacker with local access to exploit the vulnerability. This issue has been disclosed publicly, and though the project team was notified early through an issue report, no response or mitigation has been issued as of yet.

Affected Version(s)

wren 0.1

wren 0.2

wren 0.3

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-2026-3387 - Proof of Concept

References

https://vuldb.com/?id.348273
vdb-entrytechnical-description
https://vuldb.com/?ctiid.348273
signaturepermissions-required
https://vuldb.com/?submit.761312
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)
.