CVE-2026-77415JSONata: Arbitrary Code Execution via crafted JSONata expressions
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No exploitation reported and no EPSS estimate yet.
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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
- 9.3 CRITICAL (v4.0, CNA)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
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
jsonata-js jsonata jsonata_js:jsonata (from the name) | before 1.8.8; from 2.0.0, < 2.2.1 | CNA record |
References
- https://github.com/jsonata-js/jsonata/security/advisories/GHSA-66mm-25pp-rfffx-refsource-confirm
- https://github.com/jsonata-js/jsonata/pull/799x-refsource-misc
- https://github.com/jsonata-js/jsonata/pull/800x-refsource-misc
- https://github.com/jsonata-js/jsonata/pull/802x-refsource-misc
- https://github.com/jsonata-js/jsonata/commit/47c0e58542202c705726663166dbee5fcae47d06x-refsource-misc
- https://github.com/jsonata-js/jsonata/commit/4b217d514376e30cba278941298d7ba97c4a6c6ex-refsource-misc
- https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2x-refsource-misc
- https://github.com/jsonata-js/jsonata/commit/f09df8416eab8ff44926fc6527c80fb8701de159x-refsource-misc
- https://github.com/jsonata-js/jsonata/commit/f174348c7fa30f271b63ddedf0767e814004bc4dx-refsource-misc
- https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8x-refsource-misc
- https://github.com/jsonata-js/jsonata/releases/tag/v2.2.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.