There's a flaw in Python 3's pydoc.

Summary

There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.

Timeline

1. May 20, 2021, 12:00 AM UTCCVE published
2. Dec 18, 2025, 11:45 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 14, 2026, 9:49 AM UTCRecord last updated

Affected versions

• n/a python

  python 3.8.9, python 3.9.3, python 3.10.0a7

• libpythonBitnami

  fixed in 2.7.18; From 3.6.0 · fixed in 3.6.13; From 3.7.0 · fixed in 3.7.10; From 3.8.0 · fixed in 3.8.8; From 3.9.0 · fixed in 3.9.3

• pythonBitnami

  fixed in 2.7.18; From 3.6.0 · fixed in 3.6.13; From 3.7.0 · fixed in 3.7.10; From 3.8.0 · fixed in 3.8.8; From 3.9.0 · fixed in 3.9.3

• python-minBitnami

  fixed in 2.7.18; From 3.6.0 · fixed in 3.6.13; From 3.7.0 · fixed in 3.7.10; From 3.8.0 · fixed in 3.8.8; From 3.9.0 · fixed in 3.9.3

References 14