Critical severity · published Aug 21, 2026
CVE-2026-77414
JSONata: Arbitrary Code Execution via crafted JSONata expressions
9.3
CVSS
0.6%
EPSS
No
On KEV
Description
JSONata is a JSON query and transformation language. Prior to 1.8.8 and 2.2.1, the src/jsonata.js environment.lookup function used a bypassable hasOwnProperty check. Crafted expressions could use $hasOwnProperty, $spread, $string, prototype access, and $constructor to reach the object prototype and invoke process.getBuiltinModule with child_process, executing arbitrary code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.1.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JS
jsonata · jsonata-js
< 1.8.8; >= 2.0.0, < 2.2.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77414
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77414
github.com
https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2
github.com
https://github.com/jsonata-js/jsonata/pull/799
github.com
https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8
github.com
https://github.com/jsonata-js/jsonata/releases/tag/v2.2.1
github.com
https://github.com/jsonata-js/jsonata/security/advisories/GHSA-2943-5xfg-gq5f
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