CVE-2026-59726

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 16.4%, top 3% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 16%CVSS: 10.0Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
76(Track)
EG Risk 76/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
16%
EPSS %ILE
97%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 10, 2026

Advisory Details (4)

Auto-updated Sep 19, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Unauthenticated RCE in ruflo MCP bridge default docker-compose deployment · Advisory · ruvnet/ruflo · GitHub

https://github.com/ruvnet/ruflo/security/advisories/GHSA-c4hm-4h84-2cf3
github_release Patch Available

v3.16.3 — Security release (GHSA-c4hm-4h84-2cf3, ADR-166 MCP bridge RCE)

Patch available: ruvnet/ruflo v3.16.3

https://github.com/ruvnet/ruflo/releases/tag/v3.16.3
github_pr Patch Available

security(mcp-bridge): ADR-166 unauthenticated RCE — Phase 1-3 remediation + CI lock

Patch available: ruvnet/ruflo v3.38.1 (PR #2521 merged 2026-07-01)

https://github.com/ruvnet/ruflo/pull/2521
github_commit Patch Available

commit d00a0a40cd8b (ruvnet/ruflo)

Patch available: ruvnet/ruflo v3.38.1 (contains commit d00a0a40cd8b)

https://github.com/ruvnet/ruflo/commit/d00a0a40cd8bdbca877ac7f675f416bdc69accd1

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 120 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 05:36 UTCEG score recompute
  3. 2026-09-17 19:31 UTCEPSS rescore
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  1. 2026-08-28 21:42 UTCEPSS rescore
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  45. 2026-08-04 15:10 UTCEPSS rescore
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  53. 2026-08-01 04:16 UTCEPSS rescore
  54. 2026-07-30 19:10 UTCEG score recompute
  55. 2026-07-30 16:28 UTCEPSS rescore
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  60. 2026-07-28 18:32 UTCEG score recompute
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  74. 2026-07-23 03:21 UTCEG score recompute
  75. 2026-07-22 14:08 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-59726.yaml
    First seen Jan 1, 2026

    ruflo MCP Bridge - Unauthenticated RCE via terminal_execute

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59726?
CVE-2026-59726 is a critical vulnerability published on July 9, 2026. 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…
When was CVE-2026-59726 disclosed?
CVE-2026-59726 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59726 actively exploited?
CVE-2026-59726 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16% probability of exploitation in the next 30 days, which ranks it in the top 3.2% of all scored CVEs.
What is the CVSS score of CVE-2026-59726?
CVE-2026-59726 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-59726?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59726, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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