by Kastro
Paper/Archive/CVE-2026-25520

CVE-2026-25520

nyariv SandboxJS — SandboxJS has a Sandbox Escape

EPSS 0.9%public exploitCVSS 10.0
critical.is priorityof 100
52
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 58.6.586 × 2011.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, 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.

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-58jh-xv4v-pcx4refgithub.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3