JavaScript Sandbox Escape Vulnerability in SandboxJS Library
CVE-2026-25641

10CRITICAL

Key Information:

Vendor

Nyariv

Status
Sandboxjs
Vendor
CVE Published:
6 February 2026

What is CVE-2026-25641?

The SandboxJS library, prior to version 0.8.29, is subject to a vulnerability that allows attackers to escape the intended JavaScript sandbox environment. This is caused by a discrepancy between the keys used for validation and property access, enabling the injection of malicious objects that can manipulate string values during property accesses. As a result, attackers can perform unauthorized actions, compromising application security. Users are encouraged to update to version 0.8.29 to mitigate this risk.

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Affected Version(s)

SandboxJS < 0.8.29

References

https://github.com/nyariv/SandboxJS/security/advisories/G...
x_refsource_CONFIRM
https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c...
x_refsource_MISC
https://github.com/nyariv/SandboxJS/blob/6103d7147c4666fe...
x_refsource_MISC

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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