CVE-2026-77401
mediumZope AccessControl provides a general security framework for use in Zope.
Zope AccessControl provides a general security framework for use in Zope. Prior to 7.4, applications that allow untrusted users to create and execute AccessControl-controlled Python code do not safely guard str.format and str.format_map when those methods are reached through a str subclass. In both 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. A controlled format string can therefore disclose objects reachable from values available to the formatting operation. This issue is fixed in version 7.4.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/zopefoundation/AccessControl/commit/f980450eea416718be62847f34dfd518229... security-advisories@github.com
- https://github.com/zopefoundation/AccessControl/releases/tag/7.4 security-advisories@github.com
- https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-pq59-9fq7-m886 security-advisories@github.com