CVE-2023-41039
HighCVSS 8.3Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
RestrictedPython is a restricted execution environment for Python to run untrusted code. Python's 'format' functionality allows someone controlling the format string to 'read' all objects accessible through recursive attribute lookup and subscription from objects he can access, which can lead to critical information disclosure.
Risk Assessment
Critical information disclosure may lead to serious security breaches within the organization, allowing attackers access to sensitive data.
Recommendation
It is recommended to upgrade to version 5.4 or 6.2, which include a fix for this vulnerability. There are no known workarounds for this vulnerability.
Other vulnerabilities in RestrictedPython
See all- CVE-2026-55830High
RestrictedPython before version 8.3 incorrectly validated positional-only argument names, allowing protected hook names (e.g., __getattr__, _getitem_, _write_, _print_) to be shadowed by local parameters. This flaw enables bypassing the embedding application's access policy.
- CVE-2023-37271High
RestrictedPython is a tool that defines a subset of the Python language, allowing users to provide program input into a trusted environment. In versions prior to 6.1 and 5.3, an attacker could access the current stack frame in a generator, allowing them to break out of the RestrictedPython boundaries and potentially execute arbitrary code in the Python interpreter.
Original NVD description (English source)
RestrictedPython is a restricted execution environment for Python to run untrusted code. Python's "format" functionality allows someone controlling the format string to "read" all objects accessible through recursive attribute lookup and subscription from objects he can access. This can lead to critical information disclosure. With `RestrictedPython`, the format functionality is available via the `format` and `format_map` methods of `str` (and `unicode`) (accessed either via the class or its instances) and via `string.Formatter`. All known versions of `RestrictedPython` are vulnerable. This issue has been addressed in commit `4134aedcff1` which has been included in the 5.4 and 6.2 releases. Users are advised to upgrade. There are no known workarounds for this vulnerability.