CVE-2026-77415

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-94

• https://github.com/jsonata-js/jsonata/commit/47c0e58542202c705726663166dbee5fcae47d06
• https://github.com/jsonata-js/jsonata/commit/4b217d514376e30cba278941298d7ba97c4a6c6e
• https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2
• https://github.com/jsonata-js/jsonata/commit/f09df8416eab8ff44926fc6527c80fb8701de159
• https://github.com/jsonata-js/jsonata/commit/f174348c7fa30f271b63ddedf0767e814004bc4d
• https://github.com/jsonata-js/jsonata/pull/799
• https://github.com/jsonata-js/jsonata/pull/800
• https://github.com/jsonata-js/jsonata/pull/802
• https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8
• https://github.com/jsonata-js/jsonata/releases/tag/v2.2.1
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-66mm-25pp-rfff
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-66mm-25pp-rfff

Published

Aug 21, 2026

Last Modified

Aug 25, 2026

Status

Received

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