Client-Side Enforcement of Server-Side Security Affecting bandit package, versions >=0.5.1 <1.14.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-HEX-BANDIT-21755448
- published27 Oct 2026
- disclosed26 Oct 2026
- creditUnknown
Introduced: 26 Oct 2026
NewCVE-2026-110314 (opens in a new tab)How to fix?
Upgrade bandit to version 1.14.0 or higher.
Overview
bandit is a HTTP server for Plug and WebSock apps.
Affected versions of this package are vulnerable to Client-Side Enforcement of Server-Side Security via the WebSocket connection handling of mtrudel bandit allows a remote client to keep running WebSock handler code after the server has stopped its connection, via data frames sent after ignoring the server's Close frame. When a callback returns {:stop, ...}, Bandit.WebSocket.Connection sends a Close frame and enters a :closing state, but does not enforce it in handle_frame/3 or handle_info/3. By simply ignoring the close handshake and continuing to transmit data frames, an attacker can keep invoking handlers-potentially executing unauthorized or admin actions even after being explicitly rejected during initialization.