Stack-based Buffer Overflow Vulnerability in Wren-lang Compiler by Wren-lang
CVE-2026-2657

4.8MEDIUM

Key Information:

Vendor

Wren-lang

Status
Wren
Vendor
CVE Published:
18 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2657?

A stack-based buffer overflow vulnerability has been identified in the Wren programming language, affecting versions up to 0.4.0. This issue is present in the printError function within the src/vm/wren_compiler.c file, where improper handling of error messages can result in local exploitation risks. The vulnerability was disclosed publicly, and while the project was made aware of the issue through an early report, no response has been provided. Users are encouraged to review and apply necessary mitigations to secure their applications.

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-2026-2657 - Proof of Concept

References

https://vuldb.com/?id.346455
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346455
signaturepermissions-required
https://vuldb.com/?submit.752791
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)
.