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CVE-2026-59869

Nodeca Js-yaml vulnerability

7.5 HIGHPublic exploitEPSS 0.58%
  1. Published8 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Nodeca Js-yaml≥ 3.0.0 < 3.15.0 · ≥ 4.0.0 < 4.3.0

Remediation

Fixed in
Nodeca Js-yaml≥ 3.15.0

References

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Frequently asked

Is CVE-2026-59869 being actively exploited?

CVE-2026-59869 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.58%.

How severe is CVE-2026-59869?

CVE-2026-59869 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.58% probability of exploitation.

Which products are affected by CVE-2026-59869?

Affected products include Nodeca Js-yaml.

How do I fix CVE-2026-59869?

Upgrade affected software to a fixed version, for example Nodeca Js-yaml 3.15.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-59869 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.