CVE-2026-52190 Overview
CVE-2026-52190 is a stack-based buffer overflow vulnerability affecting UTT nv518G firmware version nv518GV3v3.2.7-210919-161313. The flaw resides in the gohead/sub_448384 component and allows a remote, unauthenticated attacker to trigger a denial of service condition on the affected device. The vulnerability is classified under CWE-121: Stack-based Buffer Overflow and requires no user interaction to exploit.
Critical Impact
Remote unauthenticated attackers can crash the affected UTT router, disrupting network availability for all downstream users.
Affected Products
- UTT nv518G router platform
- Firmware version nv518GV3v3.2.7-210919-161313
- The gohead/sub_448384 web server component
Discovery Timeline
- 2026-07-01 - CVE-2026-52190 published to the National Vulnerability Database (NVD)
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-52190
Vulnerability Analysis
The vulnerability exists within the sub_448384 function of the gohead embedded web server binary shipped with the UTT nv518G router. The function fails to enforce proper bounds checking on attacker-controlled input, resulting in a stack-based buffer overflow. Attackers reach the vulnerable code path over the network without authentication or user interaction.
Successful exploitation corrupts the stack and crashes the gohead process, causing the router's management interface and dependent services to become unavailable. The confidentiality and integrity of stored data remain unaffected, but availability of the device is fully impacted.
Root Cause
The root cause is missing input length validation in sub_448384 before copying attacker-supplied data into a fixed-size stack buffer. This aligns with [CWE-121] stack-based buffer overflow classification. Embedded web servers such as gohead frequently use unsafe string operations that do not enforce destination buffer boundaries.
Attack Vector
An attacker sends a crafted HTTP request to the router's management interface targeting the code path handled by sub_448384. The malformed request overwrites stack memory, triggering a crash. Because the management service is often exposed on the LAN and, in misconfigured deployments, on the WAN interface, this vulnerability is reachable from adjacent or remote networks.
No verified public exploit code is available. Technical details are referenced in the GitHub CVE Report by akuma-QAQ.
Detection Methods for CVE-2026-52190
Indicators of Compromise
- Unexpected reboots or crashes of the UTT nv518G device
- Loss of connectivity to the router's web management interface followed by automatic service restart
- Anomalous HTTP requests with oversized parameters targeting endpoints served by the gohead daemon
Detection Strategies
- Inspect HTTP traffic destined for the router management interface for abnormally long parameter values or malformed request bodies
- Correlate router crash events with inbound HTTP requests using network flow logs and syslog data
- Deploy network intrusion detection signatures that flag requests exceeding expected length bounds against the gohead web server
Monitoring Recommendations
- Enable and forward router syslog output to a central log repository for continuous monitoring of process crashes
- Monitor availability of the router management interface using synthetic health checks
- Track repeated management-interface HTTP requests originating from a single source as a possible probing indicator
How to Mitigate CVE-2026-52190
Immediate Actions Required
- Restrict access to the router's web management interface to trusted administrative networks only
- Disable remote WAN-side management on the UTT nv518G device
- Segment the router's management VLAN from general user traffic to limit reachability of the vulnerable endpoint
Patch Information
No vendor patch has been referenced in the NVD entry at the time of publication. Administrators should monitor the UTT Download Center for firmware updates addressing this vulnerability and apply them once available.
Workarounds
- Place the UTT nv518G behind a firewall that filters unsolicited HTTP requests to the management interface
- Apply access control lists (ACLs) limiting inbound connections to the router's HTTP service to specific administrator IP addresses
- Consider replacing end-of-support or unpatched devices with vendor-supported alternatives if a fix is not released
# Example ACL restricting management access to a trusted admin subnet
access-list 10 permit 192.0.2.0 0.0.0.255
access-list 10 deny any log
interface WAN
ip access-group 10 in
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
