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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: < 7.4
Patched in 7.4
Details
Python's string format functionality allows someone controlling the format string to "read" objects accessible (recursively) via attribute access and subscription from accessible objects. Those attribute accesses and subscriptions use Python's full blown getattr and getitem, not the policy restricted AccessControl variants _getattr_ and _getitem_. This can lead to critical information disclosure.
The AccessControl package already guards against direct access to the formatting functions on string instances, but these mitigations did not cover subclasses of str.
Affected are all users who allow untrusted users to create AccessControl controlled Python code and execute it.
A fix was published with version 7.4.
There is no workaround.
EPSS, exploit probability
Low0.47%
estimated chance of real-world exploitation in the next 30 days, higher than 40.6% of every CVE FIRST.org scores
Refreshed 11/1/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.
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A secure code review or supply chain review finds this before an advisory does.