CVE-2026-77415

UNKNOWN 0.0

JSONata: Arbitrary Code Execution via crafted JSONata expressions

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.1, crafted JSONata expressions could chain several object-integrity weaknesses to execute arbitrary code. The chain could overwrite $clone to mutate objects through evaluateTransformExpression, expose and deconstruct JSONata functions or lambdas through $merge.*, replace proc.arguments.forEach used by applyProcedure, and forge internal lambda state. These primitives allowed an attacker to reach prototype getters, prototype and constructor access, and process.getBuiltinModule with child_process, executing code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.1.

CWE	CWE-94
Vendor	jsonata-js
Product	jsonata
Published	Aug 21, 2026

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Affected Versions

jsonata-js / jsonata

< 1.8.8 >= 2.0.0, < 2.2.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗