CVE-2026-52186 Overview
CVE-2026-52186 is a SQL Injection vulnerability affecting UTT nv518G routers running firmware version nv518GV3v3.2.7-210919-161313. The flaw resides in the gohead/sub_463bbc component and allows a remote attacker to inject arbitrary SQL statements. Successful exploitation enables execution of arbitrary code on the target device without authentication or user interaction. The vulnerability is classified under [CWE-89] (Improper Neutralization of Special Elements used in an SQL Command).
Critical Impact
Unauthenticated remote attackers can execute arbitrary code on affected UTT nv518G devices by injecting SQL payloads through the gohead/sub_463bbc component.
Affected Products
- UTT nv518G router firmware nv518GV3v3.2.7-210919-161313
- Vulnerable component: gohead/sub_463bbc
- Vendor: UTT (UTT Download Center)
Discovery Timeline
- 2026-07-01 - CVE-2026-52186 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-52186
Vulnerability Analysis
The vulnerability affects the gohead/sub_463bbc handler within the UTT nv518G firmware. The handler processes attacker-controlled input and passes it into a SQL query without proper sanitization or parameterization. An attacker sends a crafted HTTP request over the network to reach the vulnerable endpoint. Because the device does not require authentication or user interaction for this code path, exploitation is straightforward.
Successful injection breaks out of the intended query context. The attacker can then read, modify, or delete backend data and, per the advisory, achieve arbitrary code execution on the device. Compromise of an edge router provides a foothold for lateral movement into the internal network.
EPSS data published on 2026-07-02 lists an exploit probability of 0.265% at the 17.899 percentile. No public proof-of-concept exploit or vendor patch is currently referenced in the NVD entry.
Root Cause
The root cause is improper neutralization of special elements in SQL commands [CWE-89]. The gohead/sub_463bbc function concatenates untrusted input directly into a SQL statement rather than using prepared statements or input validation. Any single quote, comment sequence, or SQL keyword supplied by the attacker is interpreted by the backend query engine.
Attack Vector
The attack vector is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP or HTTPS request to the router's management interface targeting the gohead/sub_463bbc endpoint. The malicious SQL payload is embedded in a request parameter processed by the handler. Devices exposing the management interface to the internet are directly exploitable.
See the GitHub CVE Report README for the researcher's technical analysis of the vulnerable code path.
Detection Methods for CVE-2026-52186
Indicators of Compromise
- HTTP requests to URIs containing gohead/sub_463bbc with SQL metacharacters such as single quotes, UNION SELECT, --, or ;.
- Unexpected outbound connections originating from the router management plane after receipt of crafted requests.
- Configuration changes, new administrative accounts, or modified firewall rules on the UTT nv518G device without corresponding administrator activity.
Detection Strategies
- Deploy signatures on network intrusion detection systems that inspect HTTP traffic destined for UTT device management interfaces for SQL injection patterns.
- Monitor router syslog and web management logs for repeated errors from the gohead process or malformed query parameters.
- Correlate authentication events and configuration changes on network devices with source IP reputation data.
Monitoring Recommendations
- Restrict and log all access to the router's web management interface, alerting on any request from outside the administrative subnet.
- Baseline normal traffic patterns to the device and alert on anomalous request volumes or unusual URI paths under /gohead/.
- Forward device logs to a centralized SIEM for retention and cross-source correlation.
How to Mitigate CVE-2026-52186
Immediate Actions Required
- Remove the UTT nv518G management interface from any WAN-facing or untrusted network exposure.
- Restrict management access to a dedicated administrative VLAN and specific source IP addresses using ACLs.
- Rotate all administrative credentials on affected devices and audit accounts for unauthorized additions.
- Inspect device configuration and logs for indicators of prior exploitation.
Patch Information
No vendor patch is listed in the NVD entry at the time of publication. Administrators should monitor the UTT Download Center for updated firmware for the nv518G platform and apply any released fix immediately.
Workarounds
- Place the affected router behind an upstream firewall that blocks direct access to the management interface from untrusted networks.
- Disable remote management features if they are not required for operations.
- Replace end-of-support or unpatchable UTT nv518G devices with a currently supported platform where feasible.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
