Critical severity10.0NVD Advisory· Published Feb 6, 2026· Updated Jun 17, 2026

CVE-2026-25587

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
@nyariv/sandboxjsnpm	< 0.8.29	0.8.29

Affected products

Nyariv/Sandboxjs2 versions
cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*range: <0.8.29
- (no CPE)range: < 0.8.29
ghsa-coords
pkg:npm/%40nyariv/sandboxjs
Range: < 0.8.29

Patches

Vulnerability mechanics

References

github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3nvdPatchWEB
github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xpnvdExploitVendor AdvisoryWEB
github.com/advisories/GHSA-66h4-qj4x-38xpghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-25587ghsaADVISORY

News mentions

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cvss	0.650
epss	0.001
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000