# CVE-2026-46718: Apache Calcite: A user-controled model can load arbitrary classes, leading to code execution

> Attackers can execute arbitrary code by providing a user-controlled model that triggers unsafe reflection in Apache Calcite.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 Jun 2026
- **Updated:** 2 Jun 2026
- **Also known as:** CLEANSTART-2026-CR95275, CLEANSTART-2026-HU10682, CLEANSTART-2026-UC89938, CLEANSTART-2026-WS21723, ECHO-26a2-2636-f4e1, GHSA-c2rv-hwqm-wjpg, MINI-3j7m-ffrp-8v4x, MINI-fc4x-9jfx-mg48

## What is CVE-2026-46718?

CVE-2026-46718 is a medium-severity code injection vulnerability in Apache Calcite, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Calcite.

This issue affects Apache Calcite: from 1.5.0 before 1.42.

Users are recommended to upgrade to version 1.42, which fixes the issue.

Weakness: CWE-470 (Use of Externally-Controlled Input to Select Classes or Code)

## Which versions are affected by CVE-2026-46718?

2 open source packages ship an affected version, including org.apache.calcite:calcite-core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.calcite:calcite-core` | Maven | From 1.5.0 | 1.42.0 |
| `org.apache.calcite:calcite-core` | Maven | From 1.5.0 | 1.42.0 |

Products: Apache Calcite.

## How do I fix CVE-2026-46718?

Upgrade org.apache.calcite:calcite-core to 1.42.0 or later.

## Is CVE-2026-46718 being exploited?

There is no known exploitation of CVE-2026-46718 in the wild and no public exploit code.

## Other vulnerabilities in Apache Calcite

- [CVE-2022-39135](https://insights.sbomify.com/CVE-2022-39135/): Apache Calcite: potential XEE attacks (critical 9.8)
- [CVE-2020-13955](https://insights.sbomify.com/CVE-2020-13955/): Missing Authentication for Critical Function in Apache Calcite (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46718 and fix it if it is affected.

What it is: CVE-2026-46718 is a medium-severity code injection vulnerability in Apache Calcite, published on 2 Jun 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-2026-46718 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.calcite:calcite-core (Maven): affected from 1.5.0; fixed in 1.42.0
- org.apache.calcite:calcite-core (Maven): affected from 1.5.0; fixed in 1.42.0

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-2026-46718/ (Markdown: https://insights.sbomify.com/CVE-2026-46718/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46718
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46718
- OSV: https://osv.dev/vulnerability/CVE-2026-46718

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46718/
Summaries are generated and may contain mistakes; the official description above is the record.