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CVE-2026-26954

SandboxJS has a Sandbox Escape

Published: Mar 13, 2026Updated: Mar 17, 2026 Sources: CVE List NVD GHSA BDUCWE-94
NVD MITRE
10.0CVSSCRITICAL
EPSS Score
0.5%
Top 58.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
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
Open in CVSS calculator →

Weaknesses

CWE-94

Affected Products

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

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgv
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-26954
nvd.nist.gov
https://github.com/nyariv/SandboxJS/commit/e01505b1ea49f4f13956cd12b7ce01b83d2ee085
github.com
and 5 more references View all →

Timeline

Published
Mar 13, 2026
Last Updated
Mar 17, 2026

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