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CVE-2026-25586

Nyariv Sandboxjs injection

10.0 CRITICALPublic exploitEPSS 0.73%
  1. Published6 Feb 2026

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Nyariv Sandboxjs< 0.8.29

Remediation

Fixed in
Nyariv Sandboxjs≥ 0.8.29

References

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Frequently asked

Is CVE-2026-25586 being actively exploited?

CVE-2026-25586 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.73%.

How severe is CVE-2026-25586?

CVE-2026-25586 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.73% probability of exploitation.

Which products are affected by CVE-2026-25586?

Affected products include Nyariv Sandboxjs.

How do I fix CVE-2026-25586?

Upgrade affected software to a fixed version, for example Nyariv Sandboxjs 0.8.29 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25586 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.