CVE-2026-9155 Rapid7 CVE debrief

Who should care

Defenders and security teams responsible for Rapid7 InsightConnect Sed Plugin on Linux should assess exposure and prioritize remediation. This includes reviewing system deployments, verifying the presence of the vulnerability, and applying vendor-supported updates or mitigations. Security teams should also monitor for potential exploitation attempts and review compensating controls for exposed systems.

Why it matters

CVE-2026-9155 is a high-severity OS Command Injection vulnerability in Rapid7 InsightConnect Sed Plugin on Linux. Authenticated attackers can execute arbitrary OS commands. Defenders should prioritize verification and remediation, especially in affected environments.

• Potential execution of arbitrary OS commands by authenticated attackers
• Possible compromise of systems using the Rapid7 InsightConnect Sed Plugin on Linux
• Need for input validation to prevent OS command injection
• Verification of vulnerability remediation and compensating controls

Technical summary

The vulnerability is caused by insufficient input validation in the expression parameter of the Rapid7 InsightConnect Sed Plugin on Linux. This allows authenticated attackers to execute arbitrary OS commands. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. The technical impact is that attackers can execute arbitrary OS commands, potentially leading to system compromise.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability, especially in environments where the Rapid7 InsightConnect Sed Plugin is used.

Recommended defensive actions

• Verify and remediate the vulnerability in Rapid7 InsightConnect Sed Plugin on Linux
• Implement input validation to prevent OS command injection
• Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD vulnerability detail provide information on the vulnerability, including its description, CVSS score, and affected products. The evidence is based on official CVE Program and NVD sources. However, the scope of affected products and deployments is not explicitly stated, and defenders should verify the vulnerability's presence in their environments. The CVE record was published on 2026-06-25T01:16:27.787Z and has not been modified since then. Additional review of 3

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.