CVE-2026-57278 Overview
CVE-2026-57278 is a stack buffer overflow vulnerability [CWE-120] in GeoVision GeoWebPlayer, also referenced as Web Plugin in GV-VMS documentation and WS Player in VMS-Cloud. The addon exposes a local WebSocket server that extends GeoVision web interfaces. Its connectionInfo command handler copies attacker-controlled JSON strings into fixed-size buffers using byte-by-byte loops that omit length checks. An attacker who lures a user to a malicious page can trigger the overflow through the local WebSocket, corrupting memory and potentially executing arbitrary code.
Critical Impact
Exploitation can lead to arbitrary code execution in the context of the GeoWebPlayer process, compromising confidentiality, integrity, and availability on affected hosts.
Affected Products
- GeoVision GeoWebPlayer (Web Plugin) shipped with GV-VMS
- GeoVision WS Player component for GV-Cloud / VMS-Cloud
- GeoVision web interfaces relying on the GeoWebPlayer WebSocket addon
Discovery Timeline
- 2026-07-02 - CVE-2026-57278 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-57278
Vulnerability Analysis
GeoWebPlayer starts a local WebSocket server that accepts JSON commands from localhost. The connectionInfo command supplies camera connection parameters to the plugin. Its handler, referenced in the advisory as handle_connection_info, dispatches to handle_connect_info, which parses fields such as the target ip value from the JSON payload.
The handler copies incoming string fields into fixed-size stack buffers using manual byte-by-byte copy loops. These loops iterate until a terminator is reached rather than validating the source length against the destination size. Oversized JSON string values therefore write past the buffer boundary and corrupt adjacent stack memory, including saved return addresses and structured exception handling records.
Because the WebSocket endpoint listens on the loopback interface, exploitation requires an attacker to reach localhost from the victim's browser. A malicious web page can issue the crafted connectionInfo message using a browser WebSocket, bringing the attack surface effectively to the network while requiring user interaction.
Root Cause
The root cause is missing bounds enforcement in string copy routines inside handle_connect_info. Fixed-size stack buffers receive JSON-supplied values without length validation, satisfying the classic buffer copy without checking size of input [CWE-120].
Attack Vector
An attacker hosts a page that connects to ws://127.0.0.1:<port> when a victim with GeoWebPlayer installed visits it. The page sends a connectionInfo JSON message containing an oversized ip value (and other string fields exhibiting the same flaw). The overflow overwrites stack state in the plugin process, enabling denial of service or code execution in the plugin's security context. See the Talos Intelligence Vulnerability Report for the full technical breakdown.
Detection Methods for CVE-2026-57278
Indicators of Compromise
- Unexpected crashes or restarts of the GeoWebPlayer / WS Player process on endpoints with GeoVision software installed
- Outbound browser sessions establishing WebSocket connections to 127.0.0.1 immediately after visiting untrusted web pages
- JSON connectionInfo payloads with unusually long ip, hostname, or credential string fields observed in process memory or logs
Detection Strategies
- Inventory hosts running GV-VMS, GV-Cloud, or VMS-Cloud clients and confirm whether GeoWebPlayer is installed
- Monitor for abnormal child processes or memory access violations originating from the GeoWebPlayer executable
- Alert on browser-initiated loopback WebSocket traffic to GeoWebPlayer ports from unexpected origins
Monitoring Recommendations
- Enable crash dump collection for the GeoWebPlayer process to capture overflow artifacts for analysis
- Correlate browser navigation telemetry with GeoWebPlayer process anomalies to identify drive-by exploitation attempts
- Review endpoint logs for the CWE-120 pattern of oversized JSON payloads targeting local WebSocket services
How to Mitigate CVE-2026-57278
Immediate Actions Required
- Identify all endpoints where GeoWebPlayer, Web Plugin, or WS Player is installed alongside GeoVision software
- Apply the latest security update from GeoVision as referenced on the GeoVision Cyber Security Overview page
- Restrict browser access to untrusted sites on workstations that require GeoWebPlayer
Patch Information
GeoVision publishes security updates through its GeoVision Cyber Security Overview portal. Administrators should confirm the fixed version referenced by the Talos Intelligence Vulnerability Report and deploy it to every host running GV-VMS, GV-Cloud, or VMS-Cloud components.
Workarounds
- Uninstall GeoWebPlayer on hosts that do not require the extended web interface functionality
- Block outbound loopback WebSocket connections from browsers to the GeoWebPlayer port using host firewall or browser policy where feasible
- Limit use of GeoVision web interfaces to dedicated, hardened workstations that do not browse the general internet
# Example: enumerate GeoWebPlayer installations on Windows endpoints
Get-CimInstance Win32_Product | Where-Object { $_.Name -match 'GeoWebPlayer|WS Player|Web Plugin' } | Select-Object Name, Version, Vendor
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
