CVE-2021-3426
There's a flaw in Python 3's pydoc.
Published May 20, 2021 · updated Oct 14, 2026 · python python
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
Detection, updates, and resolution for this record.
May 20, 2021 · NIST NVD
Detected
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
Oct 14, 2026 · NIST NVD
Updated
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
Affected
- cpe debian/debian linux9.0
- cpe fedoraproject/fedora32
- cpe netapp/cloud backupversion unspecified
- cpe python/pythonversion unspecified
- cpe python/python3.10.0
- cpe redhat/software collectionsversion unspecified
Sources
- CVE.orgCVE-2021-3426
Official CVE identifier
cve.org - NIST NVDCVE-2021-3426
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 normal
nvd.nist.gov