A denial of service via regular expression in the py.path.svnwc component of py (aka python-py) through 1.9.0 could be used by attackers to cause a compute-time denial of service attack by supplying malicious input to the blame functionality.
github.com/advisories/GHSA-hj5v-574p-mj7c
github.com/pytest-dev/py/issues/256
github.com/pytest-dev/py/pull/257
github.com/pytest-dev/py/pull/257/commits/4a9017dc6199d2a564b6e4b0aa39d6d8870e4144
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