CVE-2026-59868

Description

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.

CVSS Vector

References

• https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adc1
• https://github.com/nodeca/js-yaml/releases/tag/5.2.0
• https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv