jsonata-js jsonata up to 1.8.7/2.1.x Lookup Function src/functions.js lookup code injection

Summaryinfo

A vulnerability described as critical has been identified in jsonata-js jsonata up to 1.8.7/2.1.x. The affected element is the function lookup of the file src/functions.js of the component Lookup Function. The manipulation results in code injection. This vulnerability is cataloged as CVE-2026-77413. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in jsonata-js jsonata up to 1.8.7/2.1.x. It has been classified as critical. Affected is the function lookup of the file src/functions.js of the component Lookup Function. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-77413 since 08/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 1.8.8 or 2.2.0 eliminates this vulnerability.

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Productinfo

Vendor

• jsonata-js

Name

• jsonata

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7
• 2.0
• 2.1

Website

• Product: https://github.com/jsonata-js/jsonata/

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