CVE-2026-59869

Name	CVE-2026-59869
Description	js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.
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	1141820

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-js-yaml (PTS)	bullseye	3.14.1+dfsg+~3.12.6-2	vulnerable
	bookworm, trixie	4.1.0+dfsg+~4.0.5-7	vulnerable
	forky, sid	4.2.0+~4.0.9-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
node-js-yaml	source	(unstable)	(unfixed)			1141820

Notes

[trixie] - node-js-yaml <no-dsa> (Minor issue)
https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m
Fixed by: https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7 (3.15.0)
Fixed by: https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4 (4.3.0)