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CVE-2026-25641

Nyariv Sandboxjs vulnerability

10.0 CRITICALPublic exploitEPSS 0.58%
  1. Published6 Feb 2026

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, there is a sandbox escape vulnerability due to a mismatch between the key on which the validation is performed and the key used for accessing properties. Even though the key used in property accesses is annotated as string, this is never enforced. So, attackers can pass malicious objects that coerce to different string values when used, e.g., one for the time the key is sanitized using hasOwnProperty(key) and a different one for when the key is used for the actual property access. 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-2026-25641 being actively exploited?

CVE-2026-25641 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-2026-25641?

CVE-2026-25641 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.58% probability of exploitation.

Which products are affected by CVE-2026-25641?

Affected products include Nyariv Sandboxjs.

How do I fix CVE-2026-25641?

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-2026-25641 against the real software inventory on every managed device, every day. 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.