Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M

CVE-2026-77414JSONata: 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 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.6%top 52.6% 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 2.2.1, 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	jsonata	2.2.1	GHSA-2943-5xfg-gq5f
npm	jsonata	1.8.8	GHSA-2943-5xfg-gq5f

Affected products (as reported)

Vendor	Product	Versions
jsonata-js	jsonata	< 1.8.8>= 2.0.0, < 2.2.1

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-2943-5xfg-gq5f x_refsource_CONFIRM
https://github.com/jsonata-js/jsonata/pull/799 x_refsource_MISC
https://github.com/jsonata-js/jsonata/commit/59e25144fc3b7125f6befd71b8a6e14e1fa610d2 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/v2.2.1 x_refsource_MISC