Answer in brief
CVE-2026-77401 records a Medium severity (CVSS 6.8) vulnerability in Zope AccessControl: Information disclosure through Python string `format` and `format_map` functions. The current sources do not mark it as known exploited. The current feed maps zopefoundation/AccessControl (generic), AccessControl (pip), accesscontrol (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps zopefoundation/AccessControl (generic), AccessControl (pip), accesscontrol (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| zopefoundation/AccessControlgeneric | <7.4 | 7.4 |
| AccessControlpip | <7.4 | 7.4 |
| accesscontrolpypi | >=0 <7.4 | 7.4 |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.