CVE-2026-77401

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Source
https://cve.org/CVERecord?id=CVE-2026-77401
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77401.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-77401
Aliases
Published
2026-09-16T14:28:01Z
Modified
2026-09-18T08:11:08Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
Summary
Zope AccessControl: Information disclosure through Python string `format` and `format_map` functions
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.

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"
}
References

Affected packages

Git / github.com/zopefoundation/accesscontrol

Affected ranges

Type
GIT
Repo
https://github.com/zopefoundation/accesscontrol
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f980450eea416718be62847f34dfd51822938e43
Fixed
f057af7298e04325e45da8361b85e3dc10c25bb0
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "7.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

3.*
3.0.10
3.0.11
3.0.12
3.0.7
3.0.8
3.0.9
4.*
4.0
4.0a1
4.0a2
4.0a3
4.0a5
4.0a6
4.0a7
4.0b1
4.0b2
4.0b3
4.0b4
4.0b5
4.0b6
4.0b7
4.1
4.2
5.*
5.0
5.1
5.2
5.3
5.3.1
5.4
5.5
5.6
5.7
6.*
6.0
6.1
6.2
6.3
7.*
7.0
7.1
7.2
7.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77401.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "95567365946331775351211445702854802335",
                "66001858267904819631237342368770359743",
                "130597594585641328390948415441371870484",
                "47886076481932695417733069775757260442",
                "305560083633414621956399642766134114961",
                "313472931668314419297540342532299699865",
                "143659315865397406621665142705681719302"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-77401-75bc6a79",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/zopefoundation/accesscontrol/commit/f980450eea416718be62847f34dfd51822938e43",
        "target": {
            "file": "src/AccessControl/cAccessControl.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "117251557948837844079452834506023948219",
            "length": 1523
        },
        "id": "CVE-2026-77401-c3eb906d",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/zopefoundation/accesscontrol/commit/f980450eea416718be62847f34dfd51822938e43",
        "target": {
            "file": "src/AccessControl/cAccessControl.c",
            "function": "guarded_getattr"
        }
    }
]
vanir_signatures_modified 
"2026-09-18T08:11:08Z"