Vulnerability in Nodeca Js-yaml

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 eac…

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-59868?
CVE-2026-59868 is a medium-severity vulnerability in Nodeca Js-yaml, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2026-07-08.
How severe is CVE-2026-59868?
Medium severity. CVSS v3 base score is 5.3 out of 10.