Out-of-Bounds Read Vulnerability in Wren Programming Language by Wren-lang
CVE-2026-2858

4.8MEDIUM

Key Information:

Vendor

Wren-lang

Status
Wren
Vendor
CVE Published:
20 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2858?

A local vulnerability has been identified in the Wren programming language's source file parser component, specifically in the peekChar function of src/vm/wren_compiler.c. This flaw allows attackers to perform out-of-bounds reads, potentially leading to unauthorized access to sensitive data or creating instability in the application. Although the project maintainers were notified early through an issue report, no updates have been provided, and the exploit for this vulnerability is publicly available.

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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-2026-2858 - Proof of Concept

References

https://vuldb.com/?id.347097
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347097
signaturepermissions-required
https://vuldb.com/?submit.754489
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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