CVE-2026-53550: Nodeca Js-Yaml

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.

Affected products

• Nodeca Js-Yaml: before 3.15.0 (fixed in 3.15.0); from 4.0.0, before 4.2.0 (fixed in 4.2.0)

Published 2026-06-22. Last modified 2026-07-09.