Vulnerability · Published May 20, 2021 · Assigned by redhat

CVE-2021-3426

Medium 5.7

In plain English

A medium-severity information exposure in python. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.7Medium
Exploit odds (30 days)1.9%top 20.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8platform-python3.6.8-41.el8ALSA-2021:4399
AlmaLinux:8platform-python3.6.8-41.el8.almaALSA-2021:4399
AlmaLinux:8platform-python-debug3.6.8-41.el8.almaALSA-2021:4399
AlmaLinux:8platform-python-debug3.6.8-41.el8ALSA-2021:4399
AlmaLinux:8platform-python-devel3.6.8-41.el8ALSA-2021:4399
AlmaLinux:8platform-python-devel3.6.8-41.el8.almaALSA-2021:4399
AlmaLinux:8python3-idle3.6.8-41.el8ALSA-2021:4399
AlmaLinux:8python3-idle3.6.8-41.el8.almaALSA-2021:4399
AlmaLinux:8python3-test3.6.8-41.el8ALSA-2021:4399
AlmaLinux:8python3-test3.6.8-41.el8.almaALSA-2021:4399
AlmaLinux:8python3-tkinter3.6.8-41.el8.almaALSA-2021:4399
AlmaLinux:8python3-tkinter3.6.8-41.el8ALSA-2021:4399
AlmaLinux:8python38-Cython0.29.14-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-PyMySQL0.10.1-1.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-asn1crypto1.2.0-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-atomicwrites1.3.0-8.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-attrs19.3.0-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-babel2.7.0-11.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-cffi1.13.2-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-chardet3.0.4-19.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-cryptography2.8-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-idna2.8-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-jinja22.10.3-5.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-markupsafe1.1.1-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-mod_wsgi4.6.8-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-more-itertools7.2.0-5.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-numpy1.17.3-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-numpy-doc1.17.3-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-numpy-f2py1.17.3-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-packaging19.2-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pluggy0.13.0-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-ply3.11-10.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-psutil5.6.4-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-psycopg22.8.4-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-psycopg2-doc2.8.4-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-psycopg2-tests2.8.4-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-py1.8.0-8.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pycparser2.19-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pyparsing2.4.5-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pysocks1.7.1-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pytest4.6.6-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pytz2019.3-3.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-pyyaml5.4.1-1.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-requests2.22.0-9.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-scipy1.3.1-4.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-setuptools41.6.0-5.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-setuptools-wheel41.6.0-5.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-six1.12.0-10.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-urllib31.25.7-5.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-wcwidth0.1.7-16.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-wheel0.33.6-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python38-wheel-wheel0.33.6-6.module_el8.6.0+2778+cd494b30ALSA-2021:4162
AlmaLinux:8python39-Cython0.29.21-5.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-PyMySQL0.10.1-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-attrs20.3.0-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-cffi1.14.3-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-chardet3.0.4-19.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-cryptography3.3.1-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-idna2.10-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-iniconfig1.1.1-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-mod_wsgi4.7.1-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-more-itertools8.5.0-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-numpy1.19.4-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-numpy-doc1.19.4-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-numpy-f2py1.19.4-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-packaging20.4-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-pluggy0.13.1-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-ply3.11-10.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-psutil5.8.0-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-psycopg22.8.6-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-psycopg2-doc2.8.6-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-psycopg2-tests2.8.6-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-py1.10.0-1.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-pycparser2.20-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-pyparsing2.4.7-5.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-pysocks1.7.1-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-pytest6.0.2-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-pyyaml5.4.1-1.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-requests2.25.0-2.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-scipy1.5.4-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-setuptools50.3.2-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-setuptools-wheel50.3.2-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-six1.15.0-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-toml0.10.1-5.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-urllib31.25.10-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-wcwidth0.2.5-3.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-wheel1:0.35.1-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
AlmaLinux:8python39-wheel-wheel1:0.35.1-4.module_el8.6.0+2780+a40f65e1ALSA-2021:4160
Alpine:v3.20python33.9.4-r0ALPINE-CVE-2021-3426
Alpine:v3.21python33.9.4-r0ALPINE-CVE-2021-3426
Alpine:v3.22python33.9.4-r0ALPINE-CVE-2021-3426
Alpine:v3.23python33.9.4-r0ALPINE-CVE-2021-3426
Alpine:v3.24python33.9.4-r0ALPINE-CVE-2021-3426
Debian:12pypy37.3.3+dfsg-4DEBIAN-CVE-2021-3426
Debian:13pypy37.3.3+dfsg-4DEBIAN-CVE-2021-3426
Debian:14pypy37.3.3+dfsg-4DEBIAN-CVE-2021-3426
Rocky Linux:8Cython0:0.29.21-5.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8Cython0:0.29.14-4.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.5.0+672+ab6eb015RLSA-2021:4160
Rocky Linux:8PyYAML0:5.4.1-1.module+el8.4.0+574+843c4898RLSA-2021:4162
Rocky Linux:8babel0:2.7.0-11.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8mod_wsgi0:4.6.8-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8mod_wsgi0:4.7.1-4.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8numpy0:1.19.4-3.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8numpy0:1.17.3-6.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8pybind110:2.6.1-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8pytest0:4.6.6-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8pytest0:6.0.2-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-PyMySQL0:0.10.1-1.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-PyMySQL0:0.10.1-2.module+el8.4.0+597+ddf0ddeaRLSA-2021:4160
Rocky Linux:8python-PyMySQL0:0.10.1-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-PyMySQL0:0.10.1-1.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-asn1crypto0:1.2.0-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-atomicwrites0:1.3.0-8.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-attrs0:19.3.0-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-attrs0:20.3.0-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-cffi0:1.13.2-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-cffi0:1.14.3-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-chardet0:3.0.4-19.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-chardet0:3.0.4-19.module+el8.4.0+570+c2eaf144RLSA-2021:4160
Rocky Linux:8python-cryptography0:2.8-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-cryptography0:2.8-3.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-cryptography0:3.3.1-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-cryptography0:3.3.1-2.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python-idna0:2.8-6.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-idna0:2.10-3.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-iniconfig0:1.1.1-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-jinja20:2.10.3-5.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-lxml0:4.6.2-3.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python-lxml0:4.4.1-6.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-markupsafe0:1.1.1-6.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-more-itertools0:8.5.0-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-more-itertools0:7.2.0-5.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-packaging0:19.2-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-packaging0:20.4-4.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-pluggy0:0.13.0-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-pluggy0:0.13.1-3.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-ply0:3.11-10.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-ply0:3.11-10.module+el8.4.0+570+c2eaf144RLSA-2021:4160
Rocky Linux:8python-psutil0:5.8.0-4.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python-psutil0:5.6.4-4.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-psutil0:5.8.0-4.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-psycopg20:2.8.6-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-psycopg20:2.8.6-2.module+el8.6.0+795+de4edbccRLSA-2021:4160
Rocky Linux:8python-psycopg20:2.8.4-4.module+el8.6.0+794+eba84017RLSA-2021:4162
Rocky Linux:8python-psycopg20:2.8.4-4.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-psycopg20:2.8.6-2.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python-py0:1.8.0-8.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-py0:1.10.0-1.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-pycparser0:2.20-3.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-pycparser0:2.19-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-pysocks0:1.7.1-4.module+el8.4.0+570+c2eaf144RLSA-2021:4160
Rocky Linux:8python-pysocks0:1.7.1-4.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-requests0:2.22.0-9.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-requests0:2.25.0-2.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-toml0:0.10.1-5.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-urllib30:1.25.10-4.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python-urllib30:1.25.7-5.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-wcwidth0:0.2.5-3.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python-wcwidth0:0.1.7-16.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python-wheel0:0.33.6-6.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python-wheel1:0.35.1-4.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python380:3.8.8-4.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python390:3.9.6-2.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python3x-pip0:19.3.1-4.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python3x-pip0:20.2.4-6.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python3x-pyparsing0:2.4.5-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python3x-pyparsing0:2.4.7-5.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8python3x-setuptools0:41.6.0-5.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8python3x-setuptools0:50.3.2-4.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8python3x-six0:1.12.0-10.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8python3x-six0:1.15.0-3.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8pytz0:2019.3-3.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Rocky Linux:8scipy0:1.3.1-4.module+el8.5.0+672+ab6eb015RLSA-2021:4162
Rocky Linux:8scipy0:1.5.4-3.module+el8.5.0+673+10283621RLSA-2021:4160
Rocky Linux:8scipy0:1.5.4-3.module+el8.4.0+574+843c4898RLSA-2021:4160
Rocky Linux:8scipy0:1.3.1-4.module+el8.4.0+570+c2eaf144RLSA-2021:4162
Ubuntu:22.04:LTSpython3.103.10.12-1~22.04.4USN-6891-1

Affected products (as reported)

VendorProductVersions
n/a python python 3.8.9, python 3.9.3, python 3.10.0a7

Weakness: CWE-200 · Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References