CERT-FR advisory: security policy bypass vulnerability in CPython (CVE-2026-103995)
CERT-FR published advisory CERTFR-2026-AVI-1397 on 28 October 2026 regarding a vulnerability in CPython. The flaw allows an attacker to achieve a security policy bypass. It is tracked as CVE-2026-103995 and documented in Python Software Foundation security bulletin PSF-2026-47 dated 27 October 2026. All CPython versions without the latest security patch are affected.
Entenda a falha
A vulnerabilidade
CVE-2026-103995 is a vulnerability in CPython that lets an attacker bypass a security policy. The articles do not say which component is affected, what access or configuration the attacker needs, or what exactly they gain. CERT-FR says CPython versions without the latest security patch are affected. The fixes are referenced in Python Software Foundation bulletin PSF-2026-47 (27 October 2026), but no specific version numbers are given.
Como funciona
The available articles do not describe how the vulnerable process works. They say only that an attacker can cause a security policy bypass in CPython, without saying what input reaches which part of the interpreter or at which step it fails. Details would have to come from the PSF-2026-47 bulletin, which is not reproduced in the sources.
Por que é vulnerável
The root cause is not stated in the articles. The only classification given is a security policy bypass. Nothing is said about why the flaw went unnoticed or what the fix changes in the code.
Como foi descoberta
The articles do not say who found the flaw or how. They only record that the Python Software Foundation published bulletin PSF-2026-47 on 27 October 2026 and that CERT-FR issued advisory CERTFR-2026-AVI-1397 on 28 October 2026, pointing to the vendor bulletin for fixes.
Explicação gerada por IA a partir da matéria e dos artigos, em 29/10/2026 13:25.
Remediação
- Apply the fixes referenced in the PSF-2026-47 advisory and update CPython to the latest patched release.
Linha do tempo
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CERT-FR advisory: security policy bypass vulnerability in CPython (CVE-2026-103995)
ler a análise desta fonte ocultar
CERT-FR published advisory CERTFR-2026-AVI-1397 on 28 October 2026 regarding a vulnerability in CPython. The flaw allows an attacker to achieve a security policy bypass. It is tracked as CVE-2026-103995 and documented in Python Software Foundation security bulletin PSF-2026-47 dated 27 October 2026. All CPython versions without the latest security patch are affected.
Remediation
- Apply the fixes referenced in the PSF-2026-47 advisory and update CPython to the latest patched release.