CVE-2026-59870EPSS p49.1%
CVE-2026-59870CVE-2026-59870
nodeca / js-yaml
Description
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.
Scoring
| CVSS | 5.3 () |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| EPSS | 0.64% probability of exploitation · percentile 49.1% · 2026-10-05T12:00:23Z |
| Last modified | 2026-07-10 |