CVE-2026-77401
mediumPriorität · verfolgen · 0EPSS 0.005 · 40. PerzentilUSEPSS · bewertet 2026-10-27
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.
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- GHSA-pq59-9fq7-m886Zope AccessControl vulnerable to information disclosure through Python string `format` and `format_map` functions2026-09-17ghsa · osvUS
### Impact Python's string `format` functionality allows someone controlling the format string to "read" objects accessible (recursively) via attribute access and subscription from accessible objects. Those attribute accesses and subscriptions use Python's full blown `getattr` and `getitem`, not the policy restricted `AccessControl` variants `_getattr_` and `_getitem_`. This can lead to critical information disclosure. The `AccessControl` package already guards against direct access to the formatting functions on string instances, but these mitigations did not cover subclasses of `str`. Affected are all users who allow untrusted users to create AccessControl controlled Python code and execute it. ### Patches A fix was published with version 7.4. ### Workarounds There is no workaround.
- PYSEC-2026-4022Zope AccessControl vulnerable to information disclosure through Python string `format` and `format_map` functions2026-10-01vendor · osvUS
### Impact Python's string `format` functionality allows someone controlling the format string to "read" objects accessible (recursively) via attribute access and subscription from accessible objects. Those attribute accesses and subscriptions use Python's full blown `getattr` and `getitem`, not the policy restricted `AccessControl` variants `_getattr_` and `_getitem_`. This can lead to critical information disclosure. The `AccessControl` package already guards against direct access to the formatting functions on string instances, but these mitigations did not cover subclasses of `str`. Affected are all users who allow untrusted users to create AccessControl controlled Python code and execute it. ### Patches A fix was published with version 7.4. ### Workarounds There is no workaround.
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