{"id":"CVE-2026-25586","state":"PUBLISHED","title":"SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution","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.","publishedAt":"2026-02-06T19:54:38.446Z","updatedAt":"2026-02-06T20:17:19.095Z","severity":{"score":10,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["nyariv SandboxJS"],"affected":[{"vendor":"nyariv","product":"SandboxJS","versions":[{"version":"< 0.8.29","status":"affected"}]}],"references":["https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48","https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3"],"weaknesses":["CWE-74"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25586.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25586","state":"PUBLISHED","datePublished":"2026-02-06T19:54:38.446Z","dateUpdated":"2026-02-06T20:17:19.095Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-03T01:02:46.715Z"},"containers":{"cna":{"title":"SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"nyariv","product":"SandboxJS","versions":[{"version":"< 0.8.29","status":"affected"}]}],"references":[{"url":"https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48","name":"https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3","name":"https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-74","lang":"en","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-06T19:54:38.446Z"},"source":{"advisory":"GHSA-jjpw-65fv-8g48","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-06T20:17:14.791538Z","id":"CVE-2026-25586","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-06T20:17:19.095Z"}}]}}}