CVE-2026-2858 MEDIUM

CVE-2026-2858: wren-lang wren Source File wren_compiler.c peekChar out-of-bounds

Vendor Wren-Lang
Product wren
Weakness CWE-125
Published February 20, 2026
Last update February 24, 2026

CVSS base score

4.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file src/vm/wren_compiler.c of the component Source File Parser. Such manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.

Key dates

02Disclosure timeline

February 20, 2026 CVE published
February 24, 2026 Record updated