CVE-2026-110314 mtrudel CVE debrief

Who should care

Defenders responsible for bandit WebSocket connection handling, particularly those using versions between 0.5.1 and 1.14.0, should assess exposure and verify remediation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review compensating controls and monitor for potential data frames sent after ignoring the server's Close frame.

Why it matters

CVE-2026-110314 is a Client-Side Enforcement of Server-Side Security vulnerability in bandit that allows remote clients to continue executing WebSock handler code after server connection termination. Defenders should verify WebSocket connection handling, particularly in versions between 0.5.1 and 1.14.0, and apply remediation as needed.

• Potential for continued execution of WebSock handler code after server connection termination
• Possible exposure of admin-only actions to unauthorized clients
• Need for verification of WebSocket connection handling in affected bandit versions
• Requirement for monitoring and compensating controls until remediation is applied

Technical summary

A Client-Side Enforcement of Server-Side Security vulnerability exists in the WebSocket connection handling of mtrudel bandit. This 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. The issue affects bandit versions from 0.5.1 before 1.14.0. A client refused in init/1 after a failed token check could still run an admin-only action. Defenders should prioritize verifying WebSocket connection handling in bandit versions between 0.5.1 and 1.14.0.

Defensive priority

Defenders should prioritize verifying WebSocket connection handling in bandit versions between 0.5.1 and 1.14.0.

Recommended defensive actions

• Verify WebSocket connection handling in bandit versions between 0.5.1 and 1.14.0
• Check for and apply vendor remediation
• Monitor for potential data frames sent after ignoring the server's Close frame
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and NVD entry provide details on the Client-Side Enforcement of Server-Side Security vulnerability in bandit. However, the corpus does not establish versions beyond 0.5.1 and 1.14.0, exploitation, impact, or remediation, which require verification from the supplied official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.