CVE-2021-32040

Name	CVE-2021-32040
Description	It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16. Workaround: >= v4.2.16 users and all v4.4 users can add the --setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mongodb (PTS)	jessie	1:2.4.10-5+deb8u1	vulnerable
	stretch (security), stretch (lts), stretch	1:3.2.11-2+deb9u2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency
mongodb	source	jessie	(unfixed)	end-of-life
mongodb	source	stretch	(unfixed)	end-of-life
mongodb	source	(unstable)	(unfixed)

Notes

[stretch] - mongodb <end-of-life> (https://lists.debian.org/debian-lts/2020/11/msg00058.html)
https://jira.mongodb.org/browse/SERVER-58203
https://jira.mongodb.org/browse/SERVER-59299
https://jira.mongodb.org/browse/SERVER-60218