What’s Vulnerable › Vulnerabilities

CVE-2026-77413: 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: 0.7% 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 2.2.0, the src/functions.js lookup function lacked an Object.prototype.hasOwnProperty check and allowed crafted expressions to access inherited prototype members. An attacker able to supply an expression could use inherited prototype setters and getters, constructor access, valueOf, and process.getBuiltinModule to reach the child_process module and execute arbitrary code with the privileges of the host process. This issue is fixed in versions 1.8.8 and 2.2.0.

Affected products

• jsonata-js jsonata: before 2.2.0

References

• https://github.com/jsonata-js/jsonata/commit/4b217d514376e30cba278941298d7ba97c4a6c6e
• https://github.com/jsonata-js/jsonata/commit/4c5f4adfb90a9b500889d50f90050ca68888b50d
• https://github.com/jsonata-js/jsonata/pull/794
• https://github.com/jsonata-js/jsonata/releases/tag/v1.8.8
• https://github.com/jsonata-js/jsonata/releases/tag/v2.2.0
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-8gq3-vp5j-2grp
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-8gq3-vp5j-2grp

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