CVE-2026-77413

JSONata: Arbitrary Code Execution via crafted JSONata expressions

Published Aug 21, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-8gq3-vp5j-2grp JSONata: Arbitrary Code Execution via crafted JSONata expressions
History
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 24, 2026, 7:42 PM
Reserved
Aug 20, 2026, 7:55 PM
Status
Deferred
Published
Aug 21, 2026, 9:17 PM
Modified
Oct 12, 2026, 4:10 PM