CVE-2021-21419

Name	CVE-2021-21419
Description	Eventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	988342

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-eventlet (PTS)	buster	0.20.0-6	vulnerable
	bullseye	0.26.1-7+deb11u1	fixed
	bookworm	0.33.1-4	fixed
	sid, trixie	0.35.1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-eventlet	source	(unstable)	0.26.1-7			988342

Notes

[buster] - python-eventlet <no-dsa> (Minor issue)
[stretch] - python-eventlet <no-dsa> (Minor issue)
https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2
Fixed by: https://github.com/eventlet/eventlet/commit/1412f5e4125b4313f815778a1acb4d3336efcd07
Issue present as well in versions before introduction of per-message-defalte extension
or compression extension support.
Patch for 0.20 by SuSE: https://bugzilla.suse.com/attachment.cgi?id=849402&action=diff