{"cve":"CVE-2026-25586","nvd":{"published":"2026-02-06T20:16:10.770","modified":"2026-06-17T10:24:54.337","status":"Analyzed","description":"SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":10.0},"cwes":["CWE-74"],"references":["https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3","https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48","https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48"],"products":["nyariv:sandboxjs"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-25586","score":0.00702,"percentile":0.5327,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jjpw-65fv-8g48","url":"https://osv.dev/vulnerability/GHSA-jjpw-65fv-8g48","summary":"@nyariv/sandboxjs has Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution","modified":"2026-02-06T22:20:14.667Z","packages":[{"ecosystem":"npm","name":"@nyariv/sandboxjs","purl":"pkg:npm/%40nyariv/sandboxjs","ranges":["<0.8.29"],"fixed":["0.8.29"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}