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CVE-2026-25881

@nyariv/sandboxjs has host prototype pollution from sandbox via array intermediary (sandbox escape)

Published: Feb 9, 2026Updated: Feb 18, 2026 Sources: CVE List NVD GHSA BDUCWE-1321
NVD MITRE
9.0CVSSCRITICAL
EPSS Score
0.6%
Top 58.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference (e.g., Map.prototype, Set.prototype) is placed into an array and retrieved, the isGlobal taint is stripped, permitting direct prototype mutation from within the sandbox. This results in persistent host-side prototype pollution and may enable RCE in applications that use polluted properties in sensitive sinks (example gadget: execSync(obj.cmd)). This vulnerability is fixed in 0.8.31.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-1321

Affected Products

sandboxjsnyariv
On-prem
Security Products / vuln-mgmt-scanner
@nyariv/sandboxjsnpmOSS Libraries
SandboxJSnyariv
On-prem
Security Products / vuln-mgmt-scanner
nyarivindividual-devSecurity Productsaka sandboxjs
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/nyariv/SandboxJS/commit/f369f8db26649f212a6a9a2e7a1624cb2f705b53
github.com
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-ww7g-4gwx-m7wj
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-25881
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Feb 9, 2026
Last Updated
Feb 18, 2026

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