CVE-2026-77401

See a problem?
Please try reporting it to the source first.

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

2026-10-28T11:00:37Z

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

Fixed

f057af7298e04325e45da8361b85e3dc10c25bb0

Fixed

f980450eea416718be62847f34dfd51822938e43

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "7.4"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "f980450eea416718be62847f34dfd51822938e43"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "7.4",
            "range":  [
                {
                    "fixed":  "f057af7298e04325e45da8361b85e3dc10c25bb0"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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

"2026-10-28T11:00:37Z"