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Vulnerability record · CVE-2026-77415 · published 21 August 2026

CVE-2026-77415: Code injection vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.89% · top 42.2% CWE-94 · Code injection Deferred
9.3CVSS 4.0 base score
0.89%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
12References
9 Sep 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-77415), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.