Critical severityNVD Advisory· Published Feb 6, 2026· Updated Feb 6, 2026
SandboxJS has a Sandbox Escape
CVE-2026-25520
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@nyariv/sandboxjsnpm | < 0.8.29 | 0.8.29 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-58jh-xv4v-pcx4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25520ghsaADVISORY
- github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3ghsax_refsource_MISCWEB
- github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4ghsax_refsource_CONFIRMWEB
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