Vulnerability Details CVE-2026-59868
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.0%
CVSS Severity
CVSS v3 Score 5.3
References