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Multiple Vulnerabilities in Python Allowing Remote Code Execution

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Summary

CERT-FR issued advisory CERTFR-2026-AVI-0430 warning of multiple vulnerabilities in Python/CPython affecting systems without latest security patches. Two CVEs are referenced: CVE-2026-4786 and CVE-2026-6100. The vulnerabilities allow remote code execution and other unspecified security issues. Organizations running CPython should consult vendor security bulletins for patches.

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What changed

CERT-FR published a security advisory warning of multiple vulnerabilities in Python/CPython, including CVE-2026-4786 and CVE-2026-6100, which allow remote code execution and other unspecified security issues. The affected systems are CPython installations without the latest security patches.

Organizations using Python should immediately check their CPython versions against the referenced CVEs, apply the vendor-provided security patches, and monitor the Python security announcement mailing list for future updates. Given the RCE risk, unpatched Python installations should be considered high-priority for remediation.

What to do next

  1. Check CPython installations for CVE-2026-4786 and CVE-2026-6100 exposure
  2. Apply security patches per Python security bulletins HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3 and JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5
  3. Monitor Python security-announce mailing list for further updates

Archived snapshot

Apr 14, 2026

GovPing 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 14 avril 2026 N° CERTFR-2026-AVI-0430 Affaire suivie par: CERT-FR

Avis du CERT-FR

Objet: Multiples vulnérabilités dans Python

Gestion du document

| Référence | CERTFR-2026-AVI-0430 |
| Titre | Multiples vulnérabilités dans Python |
| Date de la première version | 14 avril 2026 |
| Date de la dernière version | 14 avril 2026 |
| Source(s) | Bulletin de sécurité Python HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3 du 13 avril 2026
Bulletin de sécurité Python JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5 du 13 avril 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.

Risques

  • Exécution de code arbitraire à distance
  • Non spécifié par l'éditeur

Systèmes affectés

  • CPython sans les derniers correctifs de sécurité

Résumé

De multiples vulnérabilités ont été découvertes dans Python. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance et un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Documentation

Gestion détaillée du document

  1. le 14 avril 2026 Version initiale

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Data Privacy & Cybersecurity

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Classification

Agency
CERT-FR
Published
April 14th, 2026
Instrument
Guidance
Legal weight
Non-binding
Stage
Final
Change scope
Substantive
Document ID
CERTFR-2026-AVI-0430

Who this affects

Applies to
Technology companies Government agencies Software developers
Industry sector
5112 Software & Technology
Activity scope
Vulnerability remediation Patch management Software updates
Geographic scope
France FR

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Compliance frameworks
NIST CSF
Topics
Software & Technology

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