Out-of-Bounds Read Vulnerability in Wren Language by Wren-lang
CVE-2026-3386

4.8MEDIUM

Key Information:

Vendor

Wren-lang

Status
Wren
Vendor
CVE Published:
1 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3386?

A vulnerability has been identified in the Wren Language, specifically in the emitOp function of src/vm/wren_compiler.c. This flaw allows for out-of-bounds read operations, which could potentially be exploited on a local host. The issue was reported to the project maintainers, but as of now, no public fix or response has been issued. Users of Wren Language versions up to 0.4.0 should be aware of this vulnerability and consider potential mitigation strategies.

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-2026-3386 - Proof of Concept

References

https://vuldb.com/?id.348272
vdb-entrytechnical-description
https://vuldb.com/?ctiid.348272
signaturepermissions-required
https://vuldb.com/?submit.761306
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)
.