Is CVE-2026-59869 actively exploited?

No active exploitation of CVE-2026-59869 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-59869 be exploited remotely?

Yes. CVE-2026-59869 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-59869?

CVE-2026-59869 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-59869

HIGH

CVE-2026-59869

CWE-407Published: July 8, 2026· Updated: Jul 10, 2026

7.5

CVSS v3.1

EPSS:0.35%probability of exploitation in 30 daysPercentile:27.1th

Official Description

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.

NVD Source

Technical Analysis

CVE-2026-59869 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.