CVE-2026-25520

SandboxJS has a Sandbox Escape

Published: Feb 6, 2026Updated: Feb 18, 2026 Sources: CVE List NVD GHSACWE-74

10.0CRITICAL

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

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-74

Affected Products

nyariv

individual-devaka sandboxjs

SandboxJSOn-prem

Security Products / vuln-mgmt-scanner

npm

package-ecosystem

@nyariv/sandboxjs

OSS Libraries

and 1 more affected products View all →

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4

github.com

https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3

github.com

https://nvd.nist.gov/vuln/detail/CVE-2026-25520

nvd.nist.gov

and 1 more references View all →

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