CVE-2026-25586NVD

Vulnerability Summary

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.

Severity Level

CRITICAL(10.0)

Published Date

Feb 6, 2026

Last Modified

Feb 18, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.03%Probability

Root Weakness (CWE)

CWE-74: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 10.0 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Nyariv Sandboxjs < 0.8.29

Patched Versions

Nyariv Sandboxjs 0.8.29

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