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: 3.0% (86th percentile of EPSS-scored CVEs). 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: 3.0%CVSS: 10.0Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
10.0CRITICALmedium confidence
EG Risk
76
EG Risk 76/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.0%
EPSS %ILE
87th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 9, 2026

Last Modified

July 10, 2026

Advisory Details (4)

Auto-updated Oct 10, 2026
Patch available. Sources: github, github_commit, github_pr, github_release.
githubMentions a patch (unverified)

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 v3.41.1 (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 v3.41.1 (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 7× in last 7d / 31× 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 140 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
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  1. 2026-09-15 03:11 UTCEPSS rescore
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  40. 2026-08-17 14:20 UTCEG score recompute
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  45. 2026-08-16 02:14 UTCEPSS rescore
  46. 2026-08-15 04:07 UTCEG score recompute
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  61. 2026-08-06 13:47 UTCEPSS rescore
  62. 2026-08-05 19:56 UTCEG score recompute
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  74. 2026-07-30 19:10 UTCEG score recompute
  75. 2026-07-30 16:28 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 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 3.0% probability of exploitation in the next 30 days (87th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59726?
CVE-2026-59726 has a CVSS base score of 10.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59726?
A fix for CVE-2026-59726 is available: update to the fixed version the vendor names in its advisory.

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