{"id":"CVE-2026-43898","aliases":["GHSA-g8f2-4f4f-5jqw"],"url":"https://o3.security/vulnerability/CVE-2026-43898","summary":"SandboxJS: Sandbox escape via Function.caller leakage of internal call op","details":"SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.","published":"2026-05-28T17:50:31.581Z","modified":"2026-07-15T01:49:20.771534364Z","cvss":{"score":10,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},"epss":{"score":0.00472,"percentile":0.38368,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@nyariv/sandboxjs","fixedVersion":"0.9.6"}],"fix":{"url":"https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5","label":"nyariv/SandboxJS@8268652"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43898.json"},{"type":"ADVISORY","url":"https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43898"},{"type":"FIX","url":"https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:20.771534364Z"}}