# CVE-2026-52746: JSONata: Malicious inputs to "$toMillis" function can cause resource exhaustion

> Attackers can cause denial of service in applications evaluating user-provided JSONata expressions via malicious inputs to the $toMillis function.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 17 Jul 2026
- **Updated:** 3 Aug 2026
- **Also known as:** CLEANSTART-2026-DT65418, GHSA-86vw-mfpg-wwv9, MINI-46w4-x28f-v8r4, MINI-9gx3-q359-8qj4, MINI-cxrc-pqqq-87m3, MINI-gw5q-cr79-5phj

## What is CVE-2026-52746?

CVE-2026-52746 is a high-severity denial of service vulnerability in jsonata-js jsonata, published on 17 Jul 2026. 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. Prior to 2.2.0 and 1.8.9, malicious non-matching inputs to the $toMillis function can cause superlinear backtracking in the ISO-8601 validation regex, leading to denial of service in applications that evaluate user-provided JSONata expressions. This issue is fixed in version 2.2.0 and 1.8.9.

Weakness: CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2026-52746?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `jsonata` | npm | All versions | 1.8.9 |
| `jsonata` | npm | All versions | 1.8.9 |
| `jsonata` | npm | From 2.0.0 | 2.2.0 |
| `jsonata` | npm | From 2.0.0 | 2.2.0 |

Products: Jsonata Jsonata.

## How do I fix CVE-2026-52746?

Upgrade jsonata to a fixed version for your release line: 1.8.9 or 2.2.0.

## Is CVE-2026-52746 being exploited?

There is no known exploitation of CVE-2026-52746 in the wild and no public exploit code.

## Other vulnerabilities in jsonata-js jsonata

- [CVE-2024-27307](https://insights.sbomify.com/CVE-2024-27307/): JSONata expression can pollute the "Object" prototype (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52746 and fix it if it is affected.

What it is: CVE-2026-52746 is a high-severity denial of service vulnerability in jsonata-js jsonata, published on 17 Jul 2026. 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-2026-52746 in the wild and no public exploit code.

Affected packages and fixed versions:
- jsonata (npm): affected all versions; fixed in 1.8.9
- jsonata (npm): affected all versions; fixed in 1.8.9
- jsonata (npm): affected from 2.0.0; fixed in 2.2.0
- jsonata (npm): affected from 2.0.0; fixed in 2.2.0

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-2026-52746/ (Markdown: https://insights.sbomify.com/CVE-2026-52746/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52746
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52746
- OSV: https://osv.dev/vulnerability/CVE-2026-52746

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-52746/
Summaries are generated and may contain mistakes; the official description above is the record.