What’s Vulnerable › Vulnerabilities

CVE-2026-77414: JSONata: Arbitrary Code Execution via crafted JSONata expressions

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-12
• Weakness: CWE-94

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.

Affected products

• jsonata-js jsonata: before 1.8.8; from 2.0.0, < 2.2.1

References

• https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2
• https://github.com/jsonata-js/jsonata/pull/799
• 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-2943-5xfg-gq5f
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-2943-5xfg-gq5f

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