Setuptools is a manager for Python packages.
A vulnerability has been discovered in Setuptools. See the impact field.
An inefficiency in a regular expression may end in a denial of service if an user is fetching malicious HTML from a package in PyPI or a custom PackageIndex page.
There is no known workaround at this time.
All Setuptools users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-python/setuptools-65.5.1"