JavaScript Sandbox Escape in SandboxJS Library by Nyariv
CVE-2026-23830

10CRITICAL

Key Information:

Vendor

Nyariv

Status
Sandboxjs
Vendor
CVE Published:
27 January 2026

What is CVE-2026-23830?

The SandboxJS library, which provides a JavaScript sandboxing solution, contains a vulnerability that allows attackers to escape its sandbox environment. This issue arises in versions prior to 0.8.26 due to the lack of isolation of AsyncFunction within the SandboxFunction. The non-inclusion of mappings for AsyncFunction, GeneratorFunction, and AsyncGeneratorFunction in previous versions enables attackers to access the native AsyncFunction constructor. If an attacker creates an async function inside the sandbox, they can exploit this flaw to execute code outside the sandbox, thereby gaining unrestricted access to the host environment. Version 0.8.26 rectifies this significant security concern.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

SandboxJS < 0.8.26

References

https://github.com/nyariv/SandboxJS/security/advisories/G...
x_refsource_CONFIRM
https://github.com/nyariv/SandboxJS/commit/345aee6566e479...
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
.