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Zope AccessControl: Information disclosure through Python string `format` and `format_map` functions

CVSS 3.1 6.8 MEDIUMCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-77401

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-77401

Published

AccessControl

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "zopefoundation",
                    "product": "AccessControl",
                    "versions": [
                        {
                            "version": "< 7.4",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 13 Nov 10:02 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current