CVE-2026-9155
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 · uneditedOS Command Injection vulnerability in Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to execute arbitrary OS commands via the expression parameter due to insufficient input validation.
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 · high confidenceRapid7 InsightConnect Sed Plugin on Linux contains an OS command injection vulnerability in the expression parameter due to insufficient input validation. Authenticated attackers can inject arbitrary OS commands through this parameter, potentially achieving full system compromise on the underlying host.
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= 4.2.2CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 checksWork through these to decide whether this CVE applies to you.
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Identify if Rapid7 InsightConnect Sed Plugin is installedCheck for the presence of the InsightConnect Sed Plugin installation directory or plugin files on the Linux system. Look in common plugin installation paths or check the product's plugin management interface if available.Affected if The Rapid7 InsightConnect Sed Plugin is found on the Linux host
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Confirm the operating system is LinuxRun 'uname -a' or check /etc/os-release to verify the host OS. The vulnerability specifically affects the Linux version of the plugin.Affected if The system is running Linux and has the InsightConnect Sed Plugin installed
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Check the installed Gnu Sed versionRun 'sed --version' or 'rpm -q sed' / 'dpkg -l sed' to determine the Gnu Sed version installed on the system.Affected if Gnu Sed version 4.2.2 is installed on the Linux host
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Inspect usage of the expression parameterReview configuration files, automation workflows, or scripts that invoke the InsightConnect Sed Plugin to see if the 'expression' parameter is being used. Check plugin logs or audit trails if available.Affected if The expression parameter is actively used in the InsightConnect Sed Plugin configuration or workflows
The environment is affected if Rapid7 InsightConnect Sed Plugin is running on Linux with Gnu Sed version 4.2.2 and the expression parameter is in use, allowing potential command injection via that parameter.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataImplement strict input validation and sanitization on the expression parameter, utilizing allowlists for permitted characters and avoiding direct command execution where possible.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9155 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-9155 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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