Cursor
5
Incidents
6.1
Avg Severity
2
Critical
0
High
Top Failure Modes
Security Vulnerability
1
Destructive Action
1
Infinite Loop
1
Worst Incident
STUPID-2026-0029 10/10Malicious cloned repository triggered code execution in Cursor on Windows
Windsurf
1
Incidents
7.5
Avg Severity
0
Critical
1
High
Top Failure Modes
Ignored Instructions
1
Worst Incident
STUPID-2026-0007 7.5/10Windsurf ignored .gitignore and committed node_modules and .env
Comparison Summary
| Metric | Cursor | Windsurf |
|---|---|---|
| Total Incidents | 5 | 1 |
| Avg Severity | 6.1/10 | 7.5/10 |
| Critical Incidents | 2 | 0 |
| Top Failure Mode | Security Vulnerability | Ignored Instructions |
Frequently Asked Questions
Is Cursor or Windsurf more reliable?
Based on StupidLLM data, Cursor has 5 documented failures (avg severity 6.1/10) while Windsurf has 1 (avg severity 7.5/10). Cursor shows better reliability based on average severity scores.
What are the main differences between Cursor and Windsurf failures?
Cursor's most common failure mode is security vulnerability, while Windsurf most commonly fails via ignored instructions. Cursor has 2 critical incidents vs Windsurf's 0.