# CVE-2026-4837: Eval Injection in Rapid7 Insight Agent

> An eval injection in Rapid7 Insight Agent allows remote code execution as root if an attacker controls beacon responses, though mTLS mitigates remote exploitation.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2026
- **Updated:** 13 Apr 2026
- **Also known as:** GHSA-5gqp-c836-45cr

## What is CVE-2026-4837?

CVE-2026-4837 is a medium-severity code injection vulnerability in Rapid7 Insight Agent, published on 8 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An eval() injection vulnerability in the Rapid7 Insight Agent beaconing logic for Linux versions could theoretically allow an attacker to achieve remote code execution as root via a crafted beacon response. Because the Agent uses mutual TLS (mTLS) to verify commands from the Rapid7 Platform, it is unlikely that the eval() function could be exploited remotely without prior, highly privileged access to the backend platform.

Weakness: CWE-95 (Improper Neutralization of Directives in Dynamically Evaluated Code)

## Which versions are affected by CVE-2026-4837?

It affects 1 product.


Products: Rapid7 Insight Agent.

## How do I fix CVE-2026-4837?

No fix has been published for CVE-2026-4837 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4837 being exploited?

There is no known exploitation of CVE-2026-4837 in the wild and no public exploit code.

## Other vulnerabilities in Rapid7 Insight Agent

- [CVE-2026-6482](https://insights.sbomify.com/CVE-2026-6482/): Local Privilege Escalation via OpenSSL configuration file in Insight Agent (high 8.5)
- [CVE-2021-4007](https://insights.sbomify.com/CVE-2021-4007/): Rapid7 Insight Agent Privilege Escalation (high 7.8)
- [CVE-2019-5629](https://insights.sbomify.com/CVE-2019-5629/): Privilege escalation in Insight Agent (high 7.8)
- [CVE-2026-4482](https://insights.sbomify.com/CVE-2026-4482/): Insight Agent Private Key Information Disclosure via Inherited File Permissions (medium 6.8)
- [CVE-2023-2273](https://insights.sbomify.com/CVE-2023-2273/): Rapid7 Insight Agent Directory Traversal (medium 5.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4837 and fix it if it is affected.

What it is: CVE-2026-4837 is a medium-severity code injection vulnerability in Rapid7 Insight Agent, published on 8 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4837 in the wild and no public exploit code.

Affected product: Rapid7 Insight Agent. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-4837/ (Markdown: https://insights.sbomify.com/CVE-2026-4837/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4837
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4837
- OSV: https://osv.dev/vulnerability/CVE-2026-4837

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4837/
Summaries are generated and may contain mistakes; the official description above is the record.