CVE-2026-59868: Nodeca Js-Yaml

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, 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 version 5.2.0.

Affected products

• Nodeca Js-Yaml: from 5.0.0, before 5.2.0 (fixed in 5.2.0)

Published 2026-07-08. Last modified 2026-07-13.