Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nodeca | Js-Yaml | >= 5.0.0, < 5.2.0 |
Related Weaknesses (CWE)
References
- https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adcPatch
- https://github.com/nodeca/js-yaml/releases/tag/5.2.0Release Notes
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mvExploitVendor Advisory
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mvExploitVendor Advisory
FAQ
What is CVE-2026-59868?
CVE-2026-59868 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 chai...
How severe is CVE-2026-59868?
CVE-2026-59868 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59868?
Check the references section above for vendor advisories and patch information. Affected products include: Nodeca Js-Yaml.