CPython multiple vulnerabilities enable data compromise and denial of service
Multiple vulnerabilities in CPython allow attackers to compromise data integrity, bypass security policies, and cause denial of service.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 2 CVEs 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.
The French CERT (ANSSI) has issued an advisory regarding multiple security vulnerabilities discovered in CPython, the reference implementation of the Python programming language. These vulnerabilities affect systems running CPython without the latest security patches and present several attack vectors that could be exploited by malicious actors.
The identified vulnerabilities enable attackers to achieve three primary objectives: compromising data integrity, circumventing established security policies, and causing denial-of-service conditions. Two CVEs have been assigned to track these issues: CVE-2026-3276 and CVE-2026-7774. The Python security team released patches on June 3-4, 2026, addressing these vulnerabilities.
Organizations running CPython-based applications should prioritize applying the available security updates from the official Python security bulletins. Given the widespread use of Python across development, automation, and production environments, the impact of these vulnerabilities could be significant across multiple sectors if left unpatched.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0691
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