CVE-2020-8492

NameCVE-2020-8492
DescriptionPython 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python2.7 (PTS)jessie2.7.9-2+deb8u1vulnerable
jessie (security)2.7.9-2+deb8u5vulnerable
stretch (security), stretch2.7.13-2+deb9u3vulnerable
buster2.7.16-2+deb10u1vulnerable
bullseye, sid2.7.17-1vulnerable
python3.4 (PTS)jessie3.4.2-1vulnerable
jessie (security)3.4.2-1+deb8u7vulnerable
python3.5 (PTS)stretch (security), stretch3.5.3-1+deb9u1vulnerable
python3.7 (PTS)buster3.7.3-2+deb10u1vulnerable
bullseye, sid3.7.6-1vulnerable
python3.8 (PTS)bullseye3.8.2~rc2-2vulnerable
sid3.8.2-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python2.7source(unstable)(unfixed)
python3.4source(unstable)(unfixed)
python3.5source(unstable)(unfixed)
python3.7source(unstable)(unfixed)
python3.8source(unstable)(unfixed)

Notes

[buster] - python3.7 <no-dsa> (Minor issue)
[stretch] - python3.5 <no-dsa> (Minor issue)
[jessie] - python3.4 <no-dsa> (Minor issue)
[buster] - python2.7 <no-dsa> (Minor issue)
[stretch] - python2.7 <no-dsa> (Minor issue)
[jessie] - python2.7 <no-dsa> (Minor issue)
https://bugs.python.org/issue39503
https://github.com/python/cpython/pull/18284
https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html

Search for package or bug name: Reporting problems