Critical severityOSV Advisory· Published Feb 2, 2026· Updated Feb 4, 2026
SandboxJS Prototype Pollution -> Sandbox Escape -> RCE
CVE-2026-25142
Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.27, SanboxJS does not properly restrict __lookupGetter__ which can be used to obtain prototypes, which can be used for escaping the sandbox / remote code execution. This vulnerability is fixed in 0.8.27.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@nyariv/sandboxjsnpm | < 0.8.27 | 0.8.27 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-9p4w-fq8m-2hp7ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25142ghsaADVISORY
- github.com/nyariv/SandboxJS/blob/f212a38fb5a6d4bc2bc2e2466c0c011ce8d41072/src/executor.tsghsax_refsource_MISCWEB
- github.com/nyariv/SandboxJS/commit/75c8009db32e6829b0ad92ca13bf458178442bd3ghsax_refsource_MISCWEB
- github.com/nyariv/SandboxJS/security/advisories/GHSA-9p4w-fq8m-2hp7ghsax_refsource_CONFIRMWEB
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