{"cve":"CVE-2026-77401","nvd":{"published":"2026-09-16T15:17:46.617","modified":"2026-09-30T17:43:24.057","status":"Awaiting Analysis","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N","score":6.8},"cwes":["CWE-693"],"references":["https://github.com/zopefoundation/AccessControl/commit/f980450eea416718be62847f34dfd51822938e43","https://github.com/zopefoundation/AccessControl/releases/tag/7.4","https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-pq59-9fq7-m886"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-77401","score":0.00469,"percentile":0.40302,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-pq59-9fq7-m886","url":"https://osv.dev/vulnerability/GHSA-pq59-9fq7-m886","summary":"Zope AccessControl vulnerable to information disclosure through Python string `format` and `format_map` functions","modified":"2026-10-01T17:56:05.701166603Z","packages":[{"ecosystem":"PyPI","name":"accesscontrol","purl":"pkg:pypi/accesscontrol","ranges":["<7.4"],"fixed":["7.4"]}]},{"id":"PYSEC-2026-4022","url":"https://osv.dev/vulnerability/PYSEC-2026-4022","summary":"Zope AccessControl vulnerable to information disclosure through Python string `format` and `format_map` functions","modified":"2026-10-01T17:45:03.127620253Z","packages":[{"ecosystem":"PyPI","name":"accesscontrol","purl":"pkg:pypi/accesscontrol","ranges":["<7.4"],"fixed":["7.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}