CVE-2026-57271: GeoWebPlayer Buffer Overflow Vulnerability

CVE-2026-57271 Overview

CVE-2026-57271 affects GeoWebPlayer, an addon distributed with GeoVision software including GV-VMS and GV-Cloud. The component is also referred to as "Web Plugin" in GV-VMS documentation and "WS Player" for VMS-Cloud. GeoWebPlayer runs a local WebSocket server that extends the functionality of GeoVision web interfaces. The vulnerability is an improper validation of an array index [CWE-129] triggered by a malformed pause command sent to the WebSocket server. A remote attacker can exploit this issue when a user visits an attacker-controlled page that interacts with the local WebSocket server, leading to memory corruption with potential impact to confidentiality, integrity, and availability.

Critical Impact
A specially crafted pause command sent to the GeoWebPlayer WebSocket server can trigger an out-of-bounds access, enabling remote compromise of hosts running GeoVision software when a user is lured to a malicious web page.

Affected Products

GeoVision GeoWebPlayer (Web Plugin) bundled with GV-VMS
GeoVision WS Player bundled with GV-Cloud / VMS-Cloud
Additional GeoVision software distributions that install the GeoWebPlayer addon

Discovery Timeline

2026-07-02 - CVE-2026-57271 published to the National Vulnerability Database (NVD)
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57271

Vulnerability Analysis

GeoWebPlayer creates a local WebSocket server that browser-based GeoVision interfaces connect to for media control. The server accepts JSON-style command messages, including a pause command that references an internal media stream or slot by numeric index. The handler for the pause command fails to validate that the supplied index falls within the bounds of the underlying array before dereferencing it. The result is an out-of-bounds access classified under [CWE-129] (Improper Validation of Array Index). Because the WebSocket endpoint is reachable from any origin loaded in the user's browser, a remote attacker can reach the vulnerable code path without prior authentication as long as a user visits a crafted page.

Root Cause

The root cause is missing bounds checking on the index parameter accepted by the pause command handler. The handler trusts the client-supplied index and uses it directly to look up an entry in a fixed-size internal structure. Supplying a value outside the valid range causes the process to read or write memory beyond the intended object, corrupting adjacent state within the GeoWebPlayer process.

Attack Vector

Exploitation is network-based but requires user interaction. A victim must load an attacker-controlled web page while GeoWebPlayer is running locally. The page opens a WebSocket connection to the local GeoWebPlayer server and sends a crafted pause command containing an out-of-range index. The high attack complexity and scope change reflected in the CVSS vector indicate the attacker must chain browser behavior and precise memory layout conditions, but a successful attack yields high impact to confidentiality, integrity, and availability.

No verified proof-of-concept code is published for CVE-2026-57271.
See the Talos Intelligence vulnerability report referenced below for
technical details of the pause command index-out-of-bounds condition.

Detection Methods for CVE-2026-57271

Indicators of Compromise

Unexpected crashes or restarts of the GeoWebPlayer / WS Player process on hosts running GeoVision software.
Outbound browser connections to ws://127.0.0.1 or wss://127.0.0.1 on the GeoWebPlayer port initiated from unfamiliar external web pages.
WebSocket messages containing malformed or out-of-range numeric arguments to the pause command in local application logs.

Detection Strategies

Monitor for GeoWebPlayer process termination events on endpoints where the addon is installed and correlate with recent browser activity.
Inspect application and Windows Error Reporting logs for access violation exceptions originating from the GeoWebPlayer binary.
Alert on browser navigation to untrusted domains immediately preceding a GeoWebPlayer crash on the same host.

Monitoring Recommendations

Inventory all endpoints running GeoVision software (GV-VMS, GV-Cloud) and confirm which have the GeoWebPlayer addon installed.
Track the version of GeoWebPlayer deployed and compare against the fixed version released by GeoVision.
Capture and retain endpoint telemetry that correlates browser processes, local WebSocket traffic, and GeoWebPlayer process state.

How to Mitigate CVE-2026-57271

Immediate Actions Required

Update GeoWebPlayer, Web Plugin, and WS Player to the version published by GeoVision that addresses CVE-2026-57271.
Restrict use of GeoVision web interfaces to trusted, dedicated browsers or workstations that do not browse the general internet.
Instruct operators to avoid visiting untrusted web pages while the GeoWebPlayer WebSocket server is running.

Patch Information

Refer to the GeoVision Cyber Security Overview for the vendor's security notices and the fixed release of GeoWebPlayer. Technical detail on the pause command index-out-of-bounds condition is documented in the Talos Intelligence Vulnerability Report TALOS-2026-2373.

Workarounds

Stop or disable the GeoWebPlayer WebSocket service on hosts where the plugin is not required for daily operations.
Use a host-based firewall rule to block loopback connections to the GeoWebPlayer WebSocket port from browsers not used for GeoVision management.
Segment workstations that must run GeoWebPlayer onto a management VLAN with strict egress filtering to reduce exposure to malicious external pages.

bash

# Example: block non-GeoVision browsers from reaching the local GeoWebPlayer WebSocket port on Windows
# Replace <PORT> with the port used by the installed GeoWebPlayer version
netsh advfirewall firewall add rule ^
  name="Block GeoWebPlayer loopback from untrusted browsers" ^
  dir=in action=block ^
  protocol=TCP localport=<PORT> ^
  interfacetype=loopback