SB2026080108 - Inefficient Algorithmic Complexity in js-yaml (npm)

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Main Vulnerability Database SB2026080108

SB2026080108 - Inefficient Algorithmic Complexity in js-yaml (npm)

Published: August 1, 2026

Security Bulletin ID SB2026080108
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 readFlowCollection in parser.ts when parsing untrusted YAML flow collections via load() or loadAll(). A remote attacker can send a specially crafted small YAML document to cause a denial of service.

A single request can keep one CPU busy for minutes or longer and block the Node event loop, which can stall the whole process.


Remediation

Install update from vendor's website.

References