What is CVE-2026-53550?

CVE-2026-53550 is a medium-severity vulnerability in Nodeca Js-yaml, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2026-06-22.

How severe is CVE-2026-53550?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Nodeca Js-yaml

CVE-2026-53550

js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0, 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 qua…

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

Nodeca Js-yaml — versions < 4.2.0

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53550?: CVE-2026-53550 is a medium-severity vulnerability in Nodeca Js-yaml, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2026-06-22.
How severe is CVE-2026-53550?: Medium severity. CVSS v3 base score is 5.3 out of 10.