# CERT-FR Flags CPython Security Flaw

Published: 2026-10-30 · Severity: routine
Canonical: https://vorant.io/reports/87a78c33-43bc-524d-9e4c-ccc3b24d2be2/cert-fr-flags-cpython-security-flaw
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> CERT-FR issued an advisory for an unspecified CPython vulnerability; defenders should apply the vendor's latest security patch.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1423

## What to check

- Applies to: The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation: No exploitation in the wild and no public exploit is recorded for the CVEs named.

CERT-FR published an advisory regarding a vulnerability in CPython, the reference implementation of the Python programming language. The specific nature and impact of the flaw were not detailed by the vendor, and the advisory does not indicate whether the vulnerability is being actively exploited in the wild. Affected systems are those running CPython without the latest security patch.

The vulnerability is tracked as CVE-2026-116566 and was disclosed via the official Python security announcement mailing list on October 29, 2026. CERT-FR directs administrators to the Python Software Foundation's security bulletin for patch details and remediation guidance. Given the lack of specifics on risk severity or exploitability, organizations running Python should prioritize applying the latest security update as a precautionary measure.

## Mentioned in this report

- Vulnerabilities: CVE-2026-116566

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1423

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