Inefficient Algorithmic Complexity in js-yaml (npm) - CVE-2026-84375

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Main Vulnerability Database Vulnerabilities #VU151446

Inefficient Algorithmic Complexity in js-yaml (npm) - CVE-2026-84375

Published: September 19, 2026


Vulnerability identifier: #VU151446
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-84375
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to inefficient algorithmic complexity in the js-yaml YAML loader when processing a crafted YAML document containing repeated merges of empty mappings. A remote attacker can submit a crafted YAML document to cause a denial of service.

In versions 3 and 4, merge support is enabled by default.


Affected software

js-yaml (npm)
Nautobot

How to mitigate CVE-2026-84375

Install security update from vendor's website.

js-yaml (npm) - addressed in versions 3.15.2, 4.3.2
Nautobot - addressed in versions 2.4.42, 3.2.5

External References

Related Security Bulletins