Protection Mechanism Failure Affecting accesscontrol package, versions [,7.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-ACCESSCONTROL-20159000
- published27 Sept 2026
- disclosed17 Sept 2026
- creditUnknown
Introduced: 17 Sep 2026
NewCVE-2026-77401 (opens in a new tab)How to fix?
Upgrade AccessControl to version 7.4 or higher.
Overview
Affected versions of this package are vulnerable to Protection Mechanism Failure in the format and format_map functions of Python string subclasses. An attacker can access sensitive information by supplying crafted format strings that leverage unrestricted attribute and item access.