{"id":"CVE-2026-44267","summary":"Elo: Sandbox escape to arbitrary Node.js / browser code execution via unfiltered `.constructor` member access in Elo JavaScript emitter","details":"Elo is a purely functional expression language for no-code tools. Prior to 1.0.1, plain Elo strings supplied to defaultFormats.elo.parse(), bin/elo, or elo-lang.org/try can use .constructor.constructor to reach JavaScript Function because the member_access handler in src/transform.ts does not reject meta-properties, src/compilers/javascript.ts emits the surviving property directly, and src/parser.ts accepts constructor as an ordinary identifier. The resulting generated JavaScript executes attacker-selected code in the host runtime. This permits browser script execution and session compromise on the auto-running playground and arbitrary Node.js code execution on library, CI, or DevOps hosts. This plain-string path is distinct from the programmatic AST-object injection issue. This issue is fixed in version 1.0.1.","aliases":["GHSA-33r5-xmm8-v6x5"],"modified":"2026-11-04T02:47:41.228180445Z","published":"2026-11-03T17:52:25.509Z","database_specific":{"cwe_ids":["CWE-1336","CWE-693","CWE-79","CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44267.json","unresolved_ranges":[{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"fixed":"1.0.1"}],"source":"AFFECTED_FIELD"}]},{"extracted_events":[{"range":[{"fixed":"1.0.1"},{"fixed":"1.0.1"}],"source":"DESCRIPTION"}]}],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44267.json"},{"type":"FIX","url":"https://github.com/enspirit/elo/commit/2136da1f64eec8ebf99890d3100be9394534b842"},{"type":"FIX","url":"https://github.com/enspirit/elo/commit/d2a89a8db76a244eb740687524a7e8529b7554b5"},{"type":"ADVISORY","url":"https://github.com/enspirit/elo/security/advisories/GHSA-33r5-xmm8-v6x5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44267"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/enspirit/elo","events":[{"introduced":"0"},{"fixed":"2136da1f64eec8ebf99890d3100be9394534b842"},{"fixed":"d2a89a8db76a244eb740687524a7e8529b7554b5"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"2136da1f64eec8ebf99890d3100be9394534b842"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"d2a89a8db76a244eb740687524a7e8529b7554b5"}]}]}}],"versions":["v0.9.14","v0.9.12","v0.9.11","v0.9.10","v0.9.9","v0.9.8","v0.9.7","v0.9.6","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44267.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}