CVE intelligence and bounded remediation

CVE-2026-8666 — Rapid7 Insightconnect Traceroute security vulnerability

Critical CVSS 9.8

OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, max_ttl, count, or time_out request parameters due to insufficient input validation when constructing shell commands.

Severity
Critical
CVSS
9.8 (3.1)
Published
2026-06-25
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-78

Affected products

  • rapid7 / insightconnect_traceroute

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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