CVE-2026-59869
Last modified
CVE-2026-59869 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
Description
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, 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 versions 3.15.0 and 4.3.0.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nodeca | Js-Yaml | >= 3.0.0, < 3.15.0 |
| Nodeca | Js-Yaml | >= 4.0.0, < 4.3.0 |
References
- https://github.com/nodeca/js-yaml/releases/tag/4.3.0Release Notes
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3mExploit, Vendor Advisory
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3mExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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