CVE-2026-57275 Overview
CVE-2026-57275 is a stack-based buffer overflow [CWE-120] in GeoVision GeoWebPlayer, an addon shipped with GeoVision products such as GV-VMS and GV-Cloud. GeoWebPlayer is referenced as Web Plugin in GV-VMS documentation and WS Player for VMS-Cloud. The component runs a local WebSocket server that extends GeoVision web interfaces. The connectionInfo command handler copies attacker-supplied JSON string fields into fixed-size buffers using manual byte-by-byte loops without length checks. An attacker who lures a user to a malicious page can trigger the overflow through the localhost WebSocket, leading to memory corruption and potential code execution.
Critical Impact
Successful exploitation corrupts stack memory in the GeoWebPlayer WebSocket server and can lead to arbitrary code execution with the privileges of the local user running the plugin.
Affected Products
- GeoVision GeoWebPlayer (Web Plugin / WS Player)
- GeoVision GV-VMS installations bundling GeoWebPlayer
- GeoVision GV-Cloud / VMS-Cloud deployments using WS Player
Discovery Timeline
- 2026-07-02 - CVE-2026-57275 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-57275
Vulnerability Analysis
GeoWebPlayer exposes a WebSocket server bound to localhost that accepts JSON commands from the browser. The connectionInfo command supplies camera connection parameters, including a username field. The internal routine referenced as handle_connect_info (dispatched from handle_connection_info) parses the JSON payload and copies string values into stack-allocated buffers of fixed size. The copy is implemented as a manual byte-by-byte loop that terminates on the source string end rather than the destination capacity. An attacker who can cause a browser to open a WebSocket to 127.0.0.1 on the GeoWebPlayer port can submit an oversized username value and overwrite adjacent stack memory, including saved return addresses and structured exception handlers.
Root Cause
The root cause is missing bounds validation during string ingestion in handle_connect_info. The developer used a hand-written copy loop instead of a length-limited primitive such as strncpy_s or explicit size checks against the destination buffer. Because the parsed JSON values are attacker-controlled and the destination buffers are fixed size, any oversized field produces a classic stack buffer overflow [CWE-120].
Attack Vector
Exploitation requires user interaction: the victim must visit a page that triggers a WebSocket connection to the local GeoWebPlayer service and sends a crafted connectionInfo command. Because the WebSocket listens on localhost, no network path to the target is required beyond a browser session. The high attack complexity reflects the need for reliable memory-layout control across browser-driven interactions. Successful exploitation impacts confidentiality, integrity, and availability, and the scope change indicates that the impacted process differs from the initiating browser context.
No verified public exploit code is available. See the Talos Intelligence Vulnerability Report for technical details on the vulnerable handler and field parsing.
Detection Methods for CVE-2026-57275
Indicators of Compromise
- Unexpected crashes or Windows Error Reporting entries referencing the GeoWebPlayer process shortly after browser activity.
- Browser sessions establishing WebSocket connections to ws://127.0.0.1 on GeoWebPlayer listener ports from untrusted origins.
- JSON payloads containing connectionInfo commands with abnormally long username, host, or credential fields.
Detection Strategies
- Monitor endpoints for the GeoWebPlayer process spawning child processes such as cmd.exe, powershell.exe, or rundll32.exe, which would indicate post-exploitation code execution.
- Inspect proxy or endpoint telemetry for cross-origin WebSocket handshakes targeting the loopback interface on GeoVision plugin ports.
- Alert on repeated crashes of the GeoWebPlayer WebSocket server, which may signal exploitation attempts or reliability failures during payload tuning.
Monitoring Recommendations
- Enable exploit-mitigation telemetry (DEP, ASLR, CFG) on hosts running GeoVision software and forward violations to your SIEM.
- Capture WebSocket traffic from browsers to localhost using endpoint DPI or browser telemetry where available.
- Track the installed GeoWebPlayer version across the fleet and alert on downgrades or unpatched instances.
How to Mitigate CVE-2026-57275
Immediate Actions Required
- Update GeoWebPlayer, GV-VMS, and any GeoVision product bundling the Web Plugin / WS Player to the latest release listed on the GeoVision Cyber Security page.
- Uninstall GeoWebPlayer on hosts where the plugin is not required for camera or VMS workflows.
- Restrict browsing on systems that run GeoVision management software and enforce use of trusted browsers only.
Patch Information
GeoVision publishes security fixes through its Cyber Security portal. Consult the Talos Intelligence advisory TALOS-2026-2375 for the fixed version corresponding to CVE-2026-57275 and verify the deployed GeoWebPlayer build matches the patched release.
Workarounds
- Block outbound loopback WebSocket connections to the GeoWebPlayer port from browsers when the plugin is not actively used.
- Configure host firewall rules to restrict access to the plugin's local listener to authorized processes only.
- Disable or stop the GeoWebPlayer service until the patch can be deployed, accepting the loss of web-interface functionality that depends on it.
# Windows: stop and disable the GeoWebPlayer service until patched
sc stop GeoWebPlayer
sc config GeoWebPlayer start= disabled
# Verify the running version against the vendor advisory
wmic product where "Name like 'GeoWebPlayer%'" get Name,Version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
