Based on 5 documented incidents, Cursor has an average failure severity of 6.1/10. 2 incidents were rated critical and 0 were rated high severity.

What are the most common Cursor failures?

The most common failure mode is infinite loop. Cursor has 2 critical incidents.

How many Cursor AI failures have been documented?

StupidLLM has documented 5 Cursor AI agent failures. Each incident is severity-scored on a 0-10 scale and verified against source evidence.

Cursor

AI Agent Reliability Report

According to StupidLLM's incident database, Cursor has 5 documented failures with an average severity of 6.1/10 — including 2 critical and 0 high-severity incidents.

6.1

Avg Severity /10

Total Incidents

Critical

High

Failure Modes

Infinite Loop1

Scope Explosion1

Destructive Action1

Security Vulnerability1

Hallucination1

Root Causes

Scope Misunderstanding2

Pattern Matching Error1

Tool Misuse1

Confidence Miscalibration1

Worst Documented Incident

STUPID-2026-002510.0criticalVerified

Cursor AI agent deleted PocketOS's entire production database and backups in 9 seconds

All Cursor Incidents

STUPID-2026-002510.0criticalVerified

Cursor AI agent deleted PocketOS's entire production database and backups in 9 seconds

STUPID-2026-002910.0criticalVerified

Cursor

Failure Modes

Root Causes

Worst Documented Incident

Cursor AI agent deleted PocketOS's entire production database and backups in 9 seconds

All Cursor Incidents

Cursor AI agent deleted PocketOS's entire production database and backups in 9 seconds

Malicious cloned repository triggered code execution in Cursor on Windows

Cursor entered infinite edit loop burning $200 in API costs

Cursor Agent rewrote entire file instead of making targeted edit

Cursor's own support AI 'Sam' invented a one-device login policy, triggering subscription cancellations