On June 23, 2026, the CERT-FR agency released a security alert describing several vulnerabilities in CPython, the reference implementation of the Python programming language. The flaws could allow attackers to cause a remote denial‑of‑service, compromise data confidentiality, or alter data integrity. Affected systems are any CPython installations that have not applied the latest security update. The alert references three Python security bulletins (dated June 23, 2026) and lists CVE identifiers CVE‑2026‑0864, CVE‑2026‑11940, and CVE‑2026‑11972. Administrators are advised to consult the cited bulletins for patching instructions. The agency urged timely application of the patches to mitigate the identified risks. The vulnerabilities are publicly documented, and the patches address the root causes.
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