JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.0, the src/functions.js lookup function lacked an Object.prototype.hasOwnProperty check and allowed crafted expressions to access inherited prototype members. An attacker able to supply an expression could use inherited prototype setters and getters, constructor access, valueOf, and process.getBuiltinModule to reach the child_process module and execute arbitrary code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.0.
History

Mon, 24 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 21 Aug 2026 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Jsonata-js
Jsonata-js jsonata
Vendors & Products Jsonata-js
Jsonata-js jsonata

Fri, 21 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
Description JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.0, the src/functions.js lookup function lacked an Object.prototype.hasOwnProperty check and allowed crafted expressions to access inherited prototype members. An attacker able to supply an expression could use inherited prototype setters and getters, constructor access, valueOf, and process.getBuiltinModule to reach the child_process module and execute arbitrary code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.0.
Title JSONata: Arbitrary Code Execution via crafted JSONata expressions
Weaknesses CWE-94
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-08-21T20:47:08.457Z

Updated: 2026-08-24T19:42:37.844Z

Reserved: 2026-08-20T19:55:27.024Z

Link: CVE-2026-77413

cve-icon Vulnrichment

Updated: 2026-08-24T19:42:32.917Z

cve-icon NVD

Status : Deferred

Published: 2026-08-21T21:17:07.267

Modified: 2026-09-09T21:06:39.057

Link: CVE-2026-77413

cve-icon Redhat

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