CVE-2026-57274: GeoWebPlayer Buffer Overflow Vulnerability

CVE-2026-57274 Overview

CVE-2026-57274 is a stack buffer overflow vulnerability in GeoVision GeoWebPlayer, an addon also referred to as Web Plugin in GV-VMS documentation and WS Player in VMS-Cloud. The component runs a local WebSocket server that extends the functionality of GeoVision web interfaces including GV-VMS and GV-Cloud. The flaw resides in the handle_connect_info handler, which processes the connectionInfo command received over the WebSocket channel. Attacker-controlled JSON fields are copied into fixed-size stack buffers using byte-by-byte loops that do not enforce length limits [CWE-120]. Successful exploitation can lead to arbitrary code execution in the context of the plugin process.

Critical Impact
An attacker who tricks a user into visiting a malicious page can send crafted WebSocket messages to the localhost server and overflow multiple fields, resulting in memory corruption and potential code execution.

Affected Products

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

Discovery Timeline

2026-07-02 - CVE-2026-57274 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57274

Vulnerability Analysis

GeoWebPlayer exposes a WebSocket server bound to localhost that accepts JSON commands from browser contexts. The server implements a command dispatcher, and the connectionInfo command routes to handle_connect_info. This handler parses JSON fields such as the camera password and copies them into fixed-size buffers on the stack. The copy is implemented as a manual byte-by-byte loop that terminates on a delimiter or NUL byte, without validating the destination buffer size. When an attacker supplies an overlong password value where no key is present, the loop writes past the buffer boundary and corrupts adjacent stack memory, including saved return addresses.

Root Cause

The root cause is missing bounds checking in string copy routines inside handle_connect_info. The developers relied on well-formed input rather than enforcing a maximum copy length. Because the JSON parser accepts arbitrary-length strings and the copy loop uses attacker-controlled length as its termination condition, the destination stack buffer overflows deterministically [CWE-120].

Attack Vector

Exploitation requires a user to open an attacker-controlled web page in a browser on the affected host. The page issues a WebSocket connection to the local GeoWebPlayer server and sends a connectionInfo payload containing an oversized password field. Because the vector is Network with User Interaction required and Attack Complexity High, the attacker must overcome mitigations such as ASLR, but successful exploitation impacts confidentiality, integrity, and availability. See the Talos Intelligence Vulnerability Report for the full technical write-up.

No verified public proof-of-concept code is available at time of writing. Refer to the Talos advisory for byte-level reproduction details.

Detection Methods for CVE-2026-57274

Indicators of Compromise

Unexpected crashes of the GeoWebPlayer process or Web Plugin service with access violations on the stack.
WebSocket traffic to 127.0.0.1 on the GeoWebPlayer listening port containing unusually long password or connectionInfo JSON fields.
New child processes spawned by GeoWebPlayer that do not correspond to normal camera streaming activity.

Detection Strategies

Monitor for anomalous crashes and Windows Error Reporting entries referencing the GeoWebPlayer binary.
Inspect browser-originated loopback WebSocket traffic for oversized JSON payloads targeting the plugin port.
Alert on process lineage anomalies where GeoWebPlayer spawns shells, script interpreters, or LOLBins.

Monitoring Recommendations

Enable endpoint telemetry for process creation, module loads, and thread injection events on hosts running GeoVision software.
Retain WebSocket and localhost network telemetry to support post-incident reconstruction.
Review GeoVision application logs on GV-VMS and GV-Cloud servers for repeated malformed connectionInfo requests.

How to Mitigate CVE-2026-57274

Immediate Actions Required

Inventory all endpoints and servers where GeoWebPlayer, Web Plugin, or WS Player is installed.
Apply vendor updates from the GeoVision Cyber Security Resource as soon as they are available for affected products.
Restrict which users can browse the web from hosts running GeoVision management software.

Patch Information

GeoVision publishes fixes and advisories on its GeoVision Cyber Security Resource page. Administrators should confirm they are running the fixed version of GeoWebPlayer and any bundled installer for GV-VMS or GV-Cloud that ships the vulnerable Web Plugin.

Workarounds

Uninstall GeoWebPlayer on hosts that do not require the browser plugin functionality.
Block outbound browser access on servers running GV-VMS management consoles to prevent user-interaction-based exploitation.
Use host-based firewall rules to restrict access to the GeoWebPlayer WebSocket listener to explicitly required processes.

bash

# Example Windows firewall rule to block external access to the GeoWebPlayer loopback listener
# Replace <PORT> with the actual WebSocket port used by the installed GeoWebPlayer version
netsh advfirewall firewall add rule name="Block GeoWebPlayer External" \
    dir=in action=block protocol=TCP localport=<PORT> remoteip=any