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CVE-2026-43898

SandboxJS: Sandbox escape via Function.caller leakage of internal call op

Published: May 28, 2026Updated: May 28, 2026 Sources: CVE List NVDCWE-94
10.0CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 61.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.

No summary for this CVE yet.

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
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Weaknesses

CWE-94

Affected Products

nyariv
individual-devaka sandboxjs
SandboxJSOn-prem
Security Products / vuln-mgmt-scanner
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-g8f2-4f4f-5jqw
github.com
https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5
github.com
News mentions
1

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