CVE-2021-4235

Name	CVE-2021-4235
Description	Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resources. If parsing user input, this may be used as a denial of service vector.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3479-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-yaml.v2 (PTS)	bullseye	2.4.0-1	fixed
	bookworm, sid, trixie	2.4.0-4	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-yaml.v2	source	buster	2.2.2-1+deb10u1		DLA-3479-1
golang-yaml.v2	source	(unstable)	2.2.8-1

Notes

https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241 (v2.2.3)
https://github.com/go-yaml/yaml/pull/375
https://pkg.go.dev/vuln/GO-2021-0061