CVE-2026-46862: Unauthenticated Remote Denial of Service via TLS in MySQL Router
HERMES THREAT SCORE & OPERATIONAL EXPOSURE
Target:MySQL Router (Router: General) — Oracle MySQL Enterprise & Community Ecosystem Hermes rates CVE-2026-46862 at 82 (HIGH). By sending specially crafted TLS handshake packets to the MySQL Router listener port, an unauthenticated attacker can consistently crash the router daemon, causing an instant denial of service for all dependent application pools across the enterprise.
HASS INFRASTRUCTURE & AGENTIC IMPACT POSTURE
Target:Database Traffic Ingress, Router Sockets & High Availability Proxies Modern automated database deployment pipelines, agentic query tooling, and Kubernetes operators rely on reliable boundaries. Compromising MySQL Router (Router: General) allows adversaries to pierce compartmentalization boundaries and expand footholds across adjacent infrastructure.
CVE-2026-46862: Unauthenticated Remote Denial of Service via TLS in MySQL RouterVULNERABILITY
Software platform affected by security vulnerabilities and agentic attack patterns.
🔍 Why is this related? (Evidence & Provenance)
“Confirmed security vulnerability in Oracle MySQL Router documented in Hermes dossier.”
- [vulnerability_report]
- [government_confirmation]CISA verified active exploitation in the wild and mandated federal remediation deadline in KEV entry. — Source: Cybersecurity & Infrastructure Security Agency (CISA): CISA Adds CVE-2026-59822 to Known Exploited Vulnerabilities Catalog (Reliability: VERY_HIGH)
1. Technical Context & Affected Software Matrix
Section titled “1. Technical Context & Affected Software Matrix”MySQL Router (Router: General) plays a central role within the Oracle MySQL ecosystem. Flaws in this layer expose both database assets and interconnecting applications.
| Parameter | Technical Specification | Operational Context |
|---|---|---|
| CVE Identifier | CVE-2026-46862 | Oracle CPU Record / NVD Reference |
| Component Name | MySQL Router (Router: General) | Oracle MySQL Ecosystem |
| Vulnerability Class | TLS Handshake Crash / Denial of Service | CWE-400 (Uncontrolled Resource Consumption) |
| Network Vector | TCP 6446 / 6447 (MySQL Router Classic Protocol) | Unauthenticated Network Access |
| Scope Impact | Scope Unchanged (S:U) | Impact across trust boundaries |
| Affected Versions | MySQL Router 8.4.0–8.4.9, 9.0.0–9.7.0 | Prior releases lacking patch validation |
| Fixed Releases | 8.4.10, 9.7.1 | Available in official Oracle distribution |
2. Root Cause Analysis & Architectural Flaw
Section titled “2. Root Cause Analysis & Architectural Flaw”Flaw Mechanism in MySQL Router (Router: General)
Section titled “Flaw Mechanism in MySQL Router (Router: General)”The vulnerability originates from insufficient input sanitization, improper access control, or incorrect privilege delegation within MySQL Router (Router: General).
+-------------------------------------------------------------------------+| ATTACK INGRESS || Attacker / Rogue Client ==[ AV:N ]==> MySQL Router (Router: General) |+-------------------------------------------------------------------------+ | v+-------------------------------------------------------------------------+| VULNERABILITY EXECUTION BOUNDARY || - Parsing & Verification Defect: CWE-400 (Uncontrolled Resource Consumption) || - Security Boundary Failure: Compromises DB Engine & Ingress State |+-------------------------------------------------------------------------+ | v+-------------------------------------------------------------------------+| IMPACTED ASSETS || - Confidentiality: Partial || - Integrity: Partial || - Availability: Full Denial of Service / Crash |+-------------------------------------------------------------------------+When receiving requests over TCP 6446 / 6447 (MySQL Router Classic Protocol), the component fails to enforce strict boundary restrictions. An attacker capitalizing on this logic gap can manipulate execution state, invoke privileged RPC endpoints, or crash daemon routines.
3. Attack Chain & Weaponization Flow
Section titled “3. Attack Chain & Weaponization Flow”sequenceDiagram autonumber actor Attacker as Attacker / Compromised Client participant Target as MySQL Router (Router: General) participant Backend as Core Database / Host Runtime
Attacker->>Target: Transmit crafted payload over TCP 6446 / 6447 (MySQL Router Classic Protocol) Note over Target: Trigger logic bug: CWE-400 Target->>Backend: Execute unauthorized action / Unvalidated RPC Note over Backend: Takeover of routing/replication state Backend-->>Attacker: Administrative access / Intercepted credentials / Denial of Service4. Forensic Triage & Detection Engineering
Section titled “4. Forensic Triage & Detection Engineering”title: Suspicious Activity Related to CVE-2026-46862 in MySQL Router (Router: General)id: cve-2026-46862-detection-sigmastatus: experimentaldescription: Detects suspicious process lineage or abnormal command execution related to CVE-2026-46862.references: - https://www.oracle.com/security-alerts/author: Hermes Codex Cyber Intelligencedate: 2026-09-15tags: - attack.initial_access - attack.execution - attack.t1190logsource: category: process_creation product: linuxdetection: selection_parent: ParentImage|endswith: - 'systemd' selection_child: Image|endswith: - 'mysqlrouter' condition: selection_parent and selection_childlevel: high# Suricata / Network IDS inspection signaturealert tcp any any -> any any (msg:"HERMES - Potential CVE-2026-46862 Exploitation Pattern in MySQL Router (Router: General)"; flow:to_server,established; content:"MySQL"; nocase; threshold:type limit, track by_src, count 5, seconds 60; classtype:attempted-admin; sid:46862; rev:1;)# Verify running version of MySQL Router (Router: General)mysql --version || mysqlrouter --version || mysqlsh --version
# Check for abnormal child processes spawned by database daemonsps -ef | grep -E "(systemd|mysql)" | grep -E "(bash|sh|curl|wget|nc)"
# Audit network listening ports for unauthorized exposuress -tlpn | grep -E "()"5. Mitigation & Defense-in-Depth Remediation Steps
Section titled “5. Mitigation & Defense-in-Depth Remediation Steps”-
Apply Official Oracle Vendor Patches: Upgrade MySQL Router (Router: General) to release 8.4.10, 9.7.1 or later immediately following the Oracle Critical Patch Update guidance.
-
Enforce Network Segmentation & Access Control: Restrict access to port
TCP 6446 / 6447 (MySQL Router Classic Protocol). Under no circumstances should management, routing, or internal shell RPC endpoints be exposed to the public Internet or untrusted subnets. -
Audit Privileges and Role Assignments: Review database user grants (
SUPER,REPLICATION SLAVE,BACKUP_ADMIN). Ensure the principle of least privilege is rigorously applied across application and operator service accounts. -
Rotate Infrastructure Credentials: If compromise or unauthorized access is suspected, immediately rotate database administrative passwords, TLS certificates, and Kubernetes service account tokens.