CVE-2026-55830

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.

CVSS v3 8.3 HIGH

8.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.7 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://github.com/zopefoundation/RestrictedPython/commit/3737596ec9f28c34a073cc845bd2f4c0a80cb671
https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2
https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2

Configurations

No configuration.

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) RestrictedPython es una herramienta que ayuda a definir un subconjunto del lenguaje Python que permite proporcionar una entrada de programa en un entorno de confianza. Antes de la versión 8.3, check_function_argument_names() rechazaba los nombres de ’hook’ de guardia protegidos para argumentos regulares, variádicos y de solo palabra clave, pero omitía los argumentos de solo posición, permitiendo que __getattr__, _getitem_, _write_ o _print_ fueran sombreados por un parámetro local y eludieran la política de acceso de la aplicación embebida. Este problema se corrige en la versión 8.3.

Information

Published : 2026-07-08 22:17

Updated : 2026-10-25 17:10

NVD link : CVE-2026-55830

Mitre link : CVE-2026-55830

CVE.ORG link : CVE-2026-55830

JSON object : View

Products Affected

No product.

CWE

CWE-184

Incomplete List of Disallowed Inputs

{"id": "CVE-2026-55830", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55830", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-09T13:46:05.231227Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.3, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 1.7}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "zopefoundation", "product": "RestrictedPython", "versions": [{"status": "affected", "version": "< 8.3"}]}]}], "published": "2026-07-08T22:17:15.653", "references": [{"url": "https://github.com/zopefoundation/RestrictedPython/commit/3737596ec9f28c34a073cc845bd2f4c0a80cb671", "source": "security-advisories@github.com"}, {"url": "https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2", "source": "security-advisories@github.com"}, {"url": "https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-184"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "RestrictedPython es una herramienta que ayuda a definir un subconjunto del lenguaje Python que permite proporcionar una entrada de programa en un entorno de confianza. Antes de la versi\u00f3n 8.3, check_function_argument_names() rechazaba los nombres de \u2019hook\u2019 de guardia protegidos para argumentos regulares, vari\u00e1dicos y de solo palabra clave, pero omit\u00eda los argumentos de solo posici\u00f3n, permitiendo que __getattr__, _getitem_, _write_ o _print_ fueran sombreados por un par\u00e1metro local y eludieran la pol\u00edtica de acceso de la aplicaci\u00f3n embebida. Este problema se corrige en la versi\u00f3n 8.3."}], "lastModified": "2026-10-25T17:10:00.197", "sourceIdentifier": "security-advisories@github.com"}