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

> Attackers can inject malicious JSONata expressions to pollute the Object prototype, potentially causing remote code execution or denial of service.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Mar 2024
- **Updated:** 13 Aug 2024
- **Also known as:** GHSA-fqg8-vfv7-8fj8

## What is CVE-2024-27307?

CVE-2024-27307 is a critical code injection vulnerability in jsonata-js jsonata, published on 6 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes)

## Which versions are affected by CVE-2024-27307?

4 open source packages ship an affected version, including jsonata. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `jsonata` | npm | From 1.4.0 | 1.8.7 |
| `jsonata` | npm | From 1.4.0 | 1.8.7 |
| `jsonata` | npm | From 2.0.0 | 2.0.4 |
| `jsonata` | npm | From 2.0.0 | 2.0.4 |

Products: Jsonata Jsonata.

## How do I fix CVE-2024-27307?

Upgrade jsonata to a fixed version for your release line: 1.8.7 or 2.0.4.

## Is CVE-2024-27307 being exploited?

There is no known exploitation of CVE-2024-27307 in the wild and no public exploit code.

## Other vulnerabilities in jsonata-js jsonata

- [CVE-2026-52746](https://insights.sbomify.com/CVE-2026-52746/): JSONata: Malicious inputs to "$toMillis" function can cause resource exhaustion (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-27307 and fix it if it is affected.

What it is: CVE-2024-27307 is a critical code injection vulnerability in jsonata-js jsonata, published on 6 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-27307 in the wild and no public exploit code.

Affected packages and fixed versions:
- jsonata (npm): affected from 1.4.0; fixed in 1.8.7
- jsonata (npm): affected from 1.4.0; fixed in 1.8.7
- jsonata (npm): affected from 2.0.0; fixed in 2.0.4
- jsonata (npm): affected from 2.0.0; fixed in 2.0.4

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-27307/ (Markdown: https://insights.sbomify.com/CVE-2024-27307/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-27307
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-27307
- OSV: https://osv.dev/vulnerability/CVE-2024-27307

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-27307/
Summaries are generated and may contain mistakes; the official description above is the record.