{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-47135: vm2: Sandbox escape via unblocked cross-realm Symbol.for keys + missing bridge write-trap symbol checks","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-47135","status":"final","version":"1","initial_release_date":"2026-06-12T14:14:42.022Z","current_release_date":"2026-06-13T03:55:55.641Z","revision_history":[{"date":"2026-06-12T14:14:42.022Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. Combined with the bridge's set/defineProperty/deleteProperty traps having no isDangerousCrossRealmSymbol key check, sandbox code can obtain real cross-realm symbols, write them to host objects, and control host-side behavior — verified with a full util.promisify hijack chain. This issue has been patched in version 3.11.4.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-47135 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-47135"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-47135"},{"category":"external","summary":"https://github.com/patriksimek/vm2/security/advisories/GHSA-m5q2-4fm3-vfqp","url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-m5q2-4fm3-vfqp"},{"category":"external","summary":"https://github.com/patriksimek/vm2/commit/928aef51898b5c52a05f05a40c4cfeb52e172878","url":"https://github.com/patriksimek/vm2/commit/928aef51898b5c52a05f05a40c4cfeb52e172878"},{"category":"external","summary":"https://github.com/patriksimek/vm2/releases/tag/v3.11.4","url":"https://github.com/patriksimek/vm2/releases/tag/v3.11.4"}]},"product_tree":{"branches":[{"category":"vendor","name":"patriksimek","branches":[{"category":"product_name","name":"vm2","branches":[{"category":"product_version","name":"< 3.11.4","product":{"name":"patriksimek vm2 < 3.11.4","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:patriksimek:vm2:\\<_3.11.4:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-47135","title":"vm2: Sandbox escape via unblocked cross-realm Symbol.for keys + missing bridge write-trap symbol checks","notes":[{"category":"description","text":"vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. Combined with the bridge's set/defineProperty/deleteProperty traps having no isDangerousCrossRealmSymbol key check, sandbox code can obtain real cross-realm symbols, write them to host objects, and control host-side behavior — verified with a full util.promisify hijack chain. This issue has been patched in version 3.11.4.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}