{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "7.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f980450eea416718be62847f34dfd51822938e43"
            },
            {
              "fixed": "f057af7298e04325e45da8361b85e3dc10c25bb0"
            }
          ],
          "repo": "https://github.com/zopefoundation/accesscontrol",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-pq59-9fq7-m886"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-693"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77401.json"
  },
  "details": "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.",
  "id": "CVE-2026-77401",
  "modified": "2026-09-18T03:31:00.131313441Z",
  "published": "2026-09-16T14:28:01.186Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zopefoundation/AccessControl/releases/tag/7.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77401.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-pq59-9fq7-m886"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77401"
    },
    {
      "type": "FIX",
      "url": "https://github.com/zopefoundation/AccessControl/commit/f980450eea416718be62847f34dfd51822938e43"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Zope AccessControl: Information disclosure through Python string `format` and `format_map` functions"
}