CPython security-policy bypass patched
A security-policy bypass vulnerability in CPython has been disclosed; vendors have released patches.
Sourcecert.ssi.gouv.fr — open the original
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 has published an advisory for a security-policy bypass vulnerability affecting CPython, the reference implementation of the Python programming language. The flaw is tracked as CVE-2026-4360 and allows an attacker to circumvent security policies enforced by the interpreter.
The vulnerability affects CPython installations that have not applied the latest security patches. The Python Security Response Team issued a security bulletin on 30 June 2026 with remediation guidance. Organizations running Python-based applications should prioritize patching to prevent potential exploitation.
Given the widespread deployment of Python across software ecosystems—from web applications to infrastructure automation—this vulnerability represents a significant attack surface. However, the advisory provides limited technical detail on exploitation complexity or active targeting, and no proof-of-concept or in-the-wild exploitation is mentioned.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0828
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,433 reports from 149 sources, 661 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs