CVE-2026-25586

CRITICAL

10.0

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.

CVE Details

CVSS v3.1 Score10.0

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/6/2026

Last Modified2/18/2026

Sourcenvd

Honeypot Sightings0

Affected Products

nyariv:sandboxjs

Weaknesses (CWE)

CWE-74

References

https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3(security-advisories@github.com)

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48(security-advisories@github.com)

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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