CPython Security Policy Bypass Vulnerability
Summary
CERT-FR has published advisory CERTFR-2026-AVI-0482 identifying a security vulnerability in CPython (the reference implementation of Python) that allows an attacker to bypass security policies. The vulnerability affects all unpatched versions of CPython. Organizations using Python software should immediately consult the vendor's security bulletin and apply available patches to mitigate the risk of exploitation.
“Une vulnérabilité a été découverte dans CPython. Elle permet à un attaquant de provoquer un contournement de la politique de sécurité.”
Organizations running Python in any capacity should treat this as a priority remediation item — CPython's ubiquity in web frameworks (Django, Flask), data processing (Pandas, NumPy), and AI/ML toolkits (TensorFlow, PyTorch) means the attack surface extends well beyond core application servers. IT and security teams should inventory all Python deployments, verify which version of Python is in use, and cross-reference against the Python security bulletin to confirm patch status.
About this source
CERT-FR is the French government's national cybersecurity incident response team, run by the ANSSI. Their advisory feed publishes vulnerability disclosures, active exploitation warnings, and emergency patching guidance for software in widespread enterprise use: browsers, hypervisors, ERP systems, network equipment, file transfer products. Around 180 advisories a month. The advisories are written in French but cover the same vulnerability universe as CISA, NCSC-UK, BSI's CERT-Bund, and JPCERT, often hours earlier on European-headquartered vendors. Watch this if you patch enterprise software, run a SOC, write detection content, or track Schneider, Dassault, OVH, Atos, or any French-vendor advisory faster than English-language sources will surface it. GovPing publishes each advisory with the affected vendor, severity, and CERT-FR link.
What changed
CERT-FR has issued a security advisory regarding a newly discovered vulnerability in CPython that enables security policy bypass. The vulnerability, tracked as CVE-2026-6019, allows attackers to circumvent security controls in affected Python installations. Affected parties include all organizations running unpatched versions of CPython. The primary remediation is to obtain and apply the vendor-provided security patches referenced in the Python security bulletin published April 22, 2026.
Organizations should immediately audit their Python installations to determine which versions are deployed across production systems, development environments, and CI/CD pipelines. Given CPython's widespread use in web applications, data processing, automation, and AI/ML workloads, the potential attack surface is broad. IT and security teams should verify patch status, test patches in non-production environments before deployment, and monitor for indicators of exploitation once patches are applied.
What to do next
- Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs
Archived snapshot
Apr 23, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Premier Ministre S.G.D.S.N
Agence nationale
de la sécurité des
systèmes d'information
Paris, le 23 avril 2026 N° CERTFR-2026-AVI-0482 Affaire suivie par: CERT-FR
Avis du CERT-FR
Objet: Vulnérabilité dans CPython
Gestion du document
| Référence | CERTFR-2026-AVI-0482 |
| Titre | Vulnérabilité dans CPython |
| Date de la première version | 23 avril 2026 |
| Date de la dernière version | 23 avril 2026 |
| Source(s) | Bulletin de sécurité Python IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3 du 22 avril 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 IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3 du 22 avril 2026
- https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
- Référence CVE CVE-2026-6019
- https://www.cve.org/CVERecord?id=CVE-2026-6019
Gestion détaillée du document
- le 23 avril 2026 Version initiale
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