RCE in Ruvnet Ruflo
CVE-2026-59726
Ruflo is an agent meta-harness for Claude Code and Codex. Prior to 3.16.3, ruflo's default docker-compose deployment exposed the MCP bridge POST /mcp and POST /mcp/:group endpoints without authentication, allowing an unauthenticated network attacker to invoke tools/call to terminal_execute, obtain a shell in the bridge container, read provider API keys, and poison AgentDB learning-store patterns. This issue is fixed in version 3.16.3.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.005 (39.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Ruvnet Ruflo — versions < 3.16.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-59726?
- CVE-2026-59726 is a critical-severity vulnerability in Ruvnet Ruflo, classified under OS Command Injection. CVSS score: 10.0/10. Published 2026-07-09.
- How severe is CVE-2026-59726?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-59726 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.