SB2026080109 - Inefficient Algorithmic Complexity in js-yaml (npm)

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Main Vulnerability Database SB2026080109

SB2026080109 - Inefficient Algorithmic Complexity in js-yaml (npm)

Published: August 1, 2026

Security Bulletin ID SB2026080109
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Inefficient Algorithmic Complexity (CVE-ID: N/A)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in resolveYamlOmap() when parsing untrusted YAML containing !!omap sequences. A remote attacker can send a specially crafted YAML document to cause a denial of service.

The issue is reachable through yaml.load() with the default schema, and the synchronous processing blocks the Node.js event loop for the duration of parsing.


Remediation

Install update from vendor's website.

References