Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M

CVE-2026-77413JSONata: Arbitrary Code Execution via crafted JSONata expressions

Critical 9.3

In plain English

A critical-severity code injection in jsonata from jsonata-js. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.7%top 45.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	jsonata	1.8.8	GHSA-8gq3-vp5j-2grp
npm	jsonata	2.2.0	GHSA-8gq3-vp5j-2grp

Affected products (as reported)

Vendor	Product	Versions
jsonata-js	jsonata	< 2.2.0

Weakness: CWE-94 · Vector: 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

References

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