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
Unknown Agent
4
Incidents
8.5
Avg Severity
3
Critical
0
High
Top Failure Modes
Security Vulnerability
3
Infinite Loop
1
Worst Incident
STUPID-2026-0022 10/10AI vibe-coded Next.js app pinned vulnerable dependency — cryptominer compromised production server
Comparison Summary
| Metric | Cursor | Unknown Agent |
|---|---|---|
| Total Incidents | 5 | 4 |
| Avg Severity | 6.1/10 | 8.5/10 |
| Critical Incidents | 2 | 3 |
| Top Failure Mode | Security Vulnerability | Security Vulnerability |
Frequently Asked Questions
Is Cursor or Unknown Agent more reliable?
Based on StupidLLM data, Cursor has 5 documented failures (avg severity 6.1/10) while Unknown Agent has 4 (avg severity 8.5/10). Cursor shows better reliability based on average severity scores.
What are the main differences between Cursor and Unknown Agent failures?
Cursor's most common failure mode is security vulnerability, while Unknown Agent most commonly fails via security vulnerability. Cursor has 2 critical incidents vs Unknown Agent's 3.