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Insight AgentApplication · Rapid7

CVE-2026-4837

HIGH · 7.2 CVSS v3.1 Published 2026-04-08
Fix available
A fix is available. Upgrade to 4.1.0.2 or later.
See remediation →
78/100
Remediation priority · High
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A code injection vulnerability exists in the Rapid7 Insight Agent's Linux beaconing logic where user-supplied data from beacon responses is passed to an eval() function without proper sanitization. This could theoretically allow execution of arbitrary code as root if an attacker could craft malicious beacon responses. However, the agent's use of mutual TLS (mTLS) to authenticate commands from the Rapid7 Platform significantly reduces the attack surface.

MitigationEnsure mTLS configuration between the Insight Agent and Rapid7 Platform remains intact and properly validated. Monitor for any signs of compromise to the Rapid7 backend infrastructure. Consider applying vendor patches when available.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Insight AgentApplication
Affected:< 4.1.0.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify Insight Agent for Linux is installed
    Run 'which r7agent' or check for /opt/rapid7/insightagent or similar installation directories. Also check running processes with 'ps aux | grep -i insight' or 'ps aux | grep -i rapid7'.
    Affected if The agent is not installed on the system.
  2. Determine installed Insight Agent version
    Check the agent binary version: '/opt/rapid7/insightagent/insight_agent --version' or 'r7agent --version' if in PATH. Also check RPM/Debian package: 'rpm -qa | grep -i insight' or 'dpkg -l | grep -i insight'.
    Affected if The installed version is lower than 4.1.0.2.
  3. Inspect mTLS configuration files
    Look for mTLS-related configuration in the agent config directory, typically under /opt/rapid7/insightagent/config/ or /etc/rapid7/insightagent/. Check for files containing 'mtls', 'mutual', 'certificate', or 'tls' configuration keys.
    Affected if mTLS is disabled, not configured, or improperly set up.
  4. Verify mTLS certificates are present
    Check for client certificate and key files in the agent directory, typically .pem or .crt/.key files. List contents of the agent config directory: 'ls -la /opt/rapid7/insightagent/config/' or similar path.
    Affected if Client certificates required for mTLS are missing or expired.

A system is affected only if it runs Insight Agent for Linux version below 4.1.0.2 AND has mTLS misconfigured or disabled, allowing potentially malicious beacon responses to be processed without mutual authentication verification.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 4.1.0.2 or later
Fixed in 4.1.0.2
Interim mitigation

Ensure mTLS configuration between the Insight Agent and Rapid7 Platform remains intact and properly validated. Monitor for any signs of compromise to the Rapid7 backend infrastructure. Consider applying vendor patches when available.

Recommended fix Moderate confidence

Insight Agent 4.1.0.2 or later

  1. Download Insight Agent version 4.1.0.2 or later from the Rapid7 management console or official download portal
  2. Stop the currently running Insight Agent service (e.g., sudo systemctl stop insight_agent or equivalent for your init system)
  3. Install the updated agent package using your system's package manager (dpkg -i or rpm -U)
  4. Start the Insight Agent service (e.g., sudo systemctl start insight_agent)
  5. Verify the agent is running and successfully connected to the Rapid7 Platform using 'insight_agent status' or the management console

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Insight Agent Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-4837 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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