CVE-2026-57264: GeoWebPlayer Buffer Overflow Vulnerability

CVE-2026-57264 Overview

CVE-2026-57264 is an out-of-bounds access vulnerability in GeoVision GeoWebPlayer, also known as Web Plugin in GV-VMS documentation and WS Player in VMS-Cloud. The addon installs a local WebSocket server that extends the functionality of GeoVision web interfaces including GV-VMS and GV-Cloud. Commands received by the WebSocket server accept an index parameter that is not validated against valid array bounds. Attackers can supply crafted index values to the setPIP command to read or write outside allocated array boundaries, corrupting memory state within the plugin process.

Critical Impact
A remote attacker who convinces a user to visit a malicious page can trigger out-of-bounds memory access in the GeoWebPlayer WebSocket server, leading to compromise of confidentiality, integrity, and availability.

Affected Products

GeoVision GeoWebPlayer (Web Plugin)
GeoVision GV-VMS with GeoWebPlayer addon
GeoVision GV-Cloud / VMS-Cloud (WS Player)

Discovery Timeline

2026-07-02 - CVE-2026-57264 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57264

Vulnerability Analysis

GeoWebPlayer runs a local WebSocket server that accepts commands from localhost. The server exposes control functions used by GeoVision web interfaces to manage video playback, layout, and picture-in-picture features. Several command handlers accept an index argument that selects an entry from an internal array of objects or function pointers. The vulnerability is categorized under [CWE-129] Improper Validation of Array Index.

The setPIP command handler uses the caller-supplied index without verifying that it falls within the bounds of the target array. An attacker-controlled value causes the handler to dereference memory outside the intended array, entering critical sections or invoking function pointers derived from adjacent memory. This can lead to arbitrary code execution within the plugin process context.

Root Cause

The root cause is missing bounds validation on the index parameter in WebSocket command dispatch routines. The handler trusts that index refers to a valid array slot and skips range checks before array indexing.

Attack Vector

Exploitation requires user interaction. A victim must visit a web page that opens a WebSocket connection to the local GeoWebPlayer server and issues a setPIP command with a malicious index. Because the server listens on localhost, any script executing in the user's browser can reach it. The scope change reflects that compromise of the plugin process affects data and controls owned by the GeoVision host application. Refer to the Talos Intelligence Vulnerability Report for the technical breakdown.

Detection Methods for CVE-2026-57264

Indicators of Compromise

Unexpected WebSocket connections to the local GeoWebPlayer port originating from browser processes visiting untrusted sites.
Crash dumps or access violations in the GeoWebPlayer process referencing setPIP or related command handlers.
Child processes spawned by GeoWebPlayer that do not match normal GeoVision workflows.

Detection Strategies

Monitor endpoints running GV-VMS, GV-Cloud, or GeoWebPlayer for anomalous process behavior and memory access violations.
Inspect browser telemetry for outbound requests followed by WebSocket traffic to localhost ports associated with GeoWebPlayer.
Alert on GeoWebPlayer process crashes correlated with active browser sessions.

Monitoring Recommendations

Enable process and network telemetry collection on workstations running GeoVision software.
Track loaded modules and code integrity events for the GeoWebPlayer process.
Correlate browser activity with local WebSocket traffic to identify drive-by exploitation attempts.

How to Mitigate CVE-2026-57264

Immediate Actions Required

Uninstall or disable GeoWebPlayer on systems where it is not required for GV-VMS or GV-Cloud operation.
Restrict browsing on hosts running GeoVision software to trusted internal management interfaces only.
Apply vendor updates as soon as they are released via the GeoVision Cyber Security Overview.

Patch Information

At the time of NVD publication on 2026-07-02, refer to the GeoVision Cyber Security Overview for vendor patch availability. The Talos Intelligence Vulnerability Report documents the affected versions and coordinated disclosure details.

Workarounds

Block outbound WebSocket connections from browsers to the GeoWebPlayer local listening port using host firewall rules.
Segregate GeoVision management workstations from general-purpose browsing and email.
Terminate the GeoWebPlayer service when the GV-VMS or GV-Cloud web interface is not in active use.

bash

# Configuration example: block local WebSocket access from non-GeoVision processes
# Windows Firewall rule restricting inbound access to GeoWebPlayer to authorized apps only
netsh advfirewall firewall add rule name="Block GeoWebPlayer External" ^
    dir=in action=block program="C:\Program Files\GeoVision\GeoWebPlayer\GeoWebPlayer.exe" ^
    enable=yes profile=any