# CVE-2026-9155: OS Command Injection in Rapid7 InsightConnect Sed Plugin via expression parameter.

> Authenticated attackers can execute arbitrary OS commands on Linux systems via the expression parameter in the Rapid7 InsightConnect Sed Plugin.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Jun 2026
- **Updated:** 25 Jun 2026
- **Also known as:** GHSA-v3gg-5r82-j6rc

## What is CVE-2026-9155?

CVE-2026-9155 is a high-severity command injection vulnerability in Rapid7 InsightConnect Sed Plugin, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OS 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.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-9155?

It affects 1 product.


Products: Gnu Sed.

## How do I fix CVE-2026-9155?

No fix has been published for CVE-2026-9155 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9155 being exploited?

There is no known exploitation of CVE-2026-9155 in the wild and no public exploit code.

## Other vulnerabilities in Rapid7 InsightConnect Sed Plugin

- [CVE-2026-9154](https://insights.sbomify.com/CVE-2026-9154/): Arbitrary File Write in Rapid7 InsightConnect Sed Plugin (high 7.1)
- [CVE-2026-9153](https://insights.sbomify.com/CVE-2026-9153/): Arbitrary File Read in Rapid7 InsightConnect Sed Plugin (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9155 and fix it if it is affected.

What it is: CVE-2026-9155 is a high-severity command injection vulnerability in Rapid7 InsightConnect Sed Plugin, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-9155 in the wild and no public exploit code.

Affected product: Rapid7 InsightConnect Sed Plugin. 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-2026-9155/ (Markdown: https://insights.sbomify.com/CVE-2026-9155/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9155
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9155
- OSV: https://osv.dev/vulnerability/CVE-2026-9155

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9155/
Summaries are generated and may contain mistakes; the official description above is the record.