CVE-2026-77401

Name of the Vulnerable Software and Affected Versions Zope AccessControl versions prior to 7.4

Description Applications that allow untrusted users to create and execute AccessControl-controlled Python code fail to safely guard str.format and str.format map when accessed through a str subclass. In ImplPython.py and cAccessControl.c, Python formatting can recursively access attributes and subscriptions using unrestricted getattr and getitem behavior instead of the policy-restricted getattr and getitem operations. This allows a controlled format string to disclose objects reachable from values available to the formatting operation, leading to critical information disclosure.

Recommendations Update to version 7.4.