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

Quick assessment

Affected
wren-lang wren
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wren是Wren开源的一个并发脚本语言。 wren 0.4.0及之前版本存在缓冲区错误漏洞，该漏洞源于src/vm/wren_compiler.c文件中peekChar函数存在越界读取。

CVSS 3.3 · Low EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-2858

Vulnerability Information
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Vulnerability Title
wren-lang wren Source File wren_compiler.c peekChar out-of-bounds
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
wren 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wren是Wren开源的一个并发脚本语言。 wren 0.4.0及之前版本存在缓冲区错误漏洞，该漏洞源于src/vm/wren_compiler.c文件中peekChar函数存在越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wren-lang wren 0.1 -

II. Public POCs for CVE-2026-2858

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III. Intelligence Information for CVE-2026-2858

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Patches & Fixes for CVE-2026-2858 (1)

IV. Related Vulnerabilities

Same product: wren
Same vendor: wren-lang
Same weakness: CWE-125