CVE-2026-77413
Critical
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.
SeverityCritical
CVSS9.3
Exploit probability—
ProductJsonata
PublishedAug 21, 2026
First seenAug 21, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- jsonata1.8.8, 2.2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jsonatanpm | v < 1.8.8, 2.0.0 ≤ v < 2.2.0 | 1.8.8, 2.2.0 |
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