CVE-2021-21240

Name	CVE-2021-21240
Description	httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	982738

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-httplib2 (PTS)	bullseye	0.18.1-3	vulnerable
	bookworm	0.20.4-3	fixed
	forky, sid, trixie	0.22.0-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-httplib2	source	(unstable)	0.20.2-1			982738

Notes

[bullseye] - python-httplib2 <no-dsa> (Minor issue)
[buster] - python-httplib2 <no-dsa> (Minor issue)
[stretch] - python-httplib2 <no-dsa> (Minor issue)
https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m
https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc (v0.19.0)
https://github.com/httplib2/httplib2/pull/182