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CVE-2026-55830— RestrictedPython guard hooks can be shadowed via positional-only arguments

Quick assessment

Affected
zopefoundation RestrictedPython
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zope RestrictedPython是Zope基金会开源的一个帮助定义 Python 语言子集的工具,该子集允许将程序输入提供到受信任的环境中。 Zope restrictedpython 8.3之前版本存在输入验证错误漏洞，该漏洞源于check_function_argument_names()函数未检查仅位置参数，导致__getattr__、_getitem_、_write_或_print_被本地参数遮蔽，从而绕过嵌入应用程序的访问策略。

CVSS 8.3 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
zopefoundation RestrictedPython < 8.3 affected
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I. Basic Information for CVE-2026-55830

Vulnerability Information
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Vulnerability Title
RestrictedPython guard hooks can be shadowed via positional-only arguments
Source: CVE Program / CVE List V5
Vulnerability Description
RestrictedPython is a tool that helps to define a subset of the Python language which allows to provide a program input into a trusted environment. Prior to 8.3, check_function_argument_names() rejected protected guard hook names for regular, variadic, and keyword-only arguments but omitted positional-only arguments, allowing __getattr__, _getitem_, _write_, or _print_ to be shadowed by a local parameter and bypass the embedding application's access policy. This issue is fixed in version 8.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
Zope RestrictedPython 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zope RestrictedPython是Zope基金会开源的一个帮助定义 Python 语言子集的工具,该子集允许将程序输入提供到受信任的环境中。 Zope restrictedpython 8.3之前版本存在输入验证错误漏洞，该漏洞源于check_function_argument_names()函数未检查仅位置参数，导致__getattr__、_getitem_、_write_或_print_被本地参数遮蔽，从而绕过嵌入应用程序的访问策略。
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
zopefoundation RestrictedPython < 8.3 -

II. Public POCs for CVE-2026-55830

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6485 chars
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III. Intelligence Information for CVE-2026-55830

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Patches & Fixes for CVE-2026-55830 (1)

Vendor Advisories for CVE-2026-55830 (1)

IV. Related Vulnerabilities

Same product: RestrictedPython
Same vendor: zopefoundation
Same weakness: CWE-184

V. Comments for CVE-2026-55830

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