by Kastro
Paper/Archive/CVE-2026-25587

CVE-2026-25587

nyariv SandboxJS — SandboxJS has a Sandbox Escape

EPSS 0.7%public exploitCVSS 10.0
critical.is priorityof 100
51
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 53.6.536 × 2010.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
SandboxJS< 0.8.29–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xprefgithub.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3