CPython Vulnerability Allows Security Policy Bypass
Summary
CERT-FR has issued an advisory regarding a vulnerability in CPython that allows for security policy bypass. The advisory urges users to apply the latest security patches to affected systems. The vulnerability is identified by CVE-2026-4519.
What changed
CERT-FR, the French national cybersecurity agency, has issued an advisory (CERTFR-2026-AVI-0335) detailing a vulnerability discovered in CPython, the reference implementation of the Python programming language. This vulnerability, identified as CVE-2026-4519, allows an attacker to bypass security policies. The advisory states that systems running CPython without the latest security patches are affected.
Affected entities are advised to refer to the official Python security bulletin for patch information. This advisory highlights the critical need for timely application of security updates to software components to prevent potential policy circumvention and security breaches. While no specific compliance deadline is mentioned, prompt patching is essential for maintaining system integrity and security.
What to do next
- Apply the latest security patches for CPython as provided by the Python security bulletin.
- Review systems to ensure CPython installations are up-to-date.
Source document (simplified)
Premier Ministre S.G.D.S.N
Agence nationale
de la sécurité des
systèmes d'information
Paris, le 23 mars 2026 N° CERTFR-2026-AVI-0335 Affaire suivie par: CERT-FR
Avis du CERT-FR
Objet: Vulnérabilité dans CPython
Gestion du document
| Référence | CERTFR-2026-AVI-0335 |
| Titre | Vulnérabilité dans CPython |
| Date de la première version | 23 mars 2026 |
| Date de la dernière version | 23 mars 2026 |
| Source(s) | Bulletin de sécurité Python AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS du 20 mars 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.
Risque
- Contournement de la politique de sécurité
Systèmes affectés
- CPython sans le dernier correctif de sécurité
Résumé
Une vulnérabilité a été découverte dans CPython. Elle permet à un attaquant de provoquer un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Documentation
- Bulletin de sécurité Python AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS du 20 mars 2026
- https://mail.python.org/archives/list/security-announce@python.org/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/
- Référence CVE CVE-2026-4519
- https://www.cve.org/CVERecord?id=CVE-2026-4519
Gestion détaillée du document
- le 23 mars 2026 Version initiale
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