Hey, thanks for the report. This is a known critical issue affecting several users - you’re seeing the same “Flask CSV duplicate finder” contamination others have reported.
Tracking status:
- Forum topic: Data contamination in Cursor conversations
What’s happening: during chat context summarization (when the context fills up), a contaminated summary about a Flask CSV app is injected into conversations, regardless of your project type.
Affected: at least 6 users across different project types (Vue, Next.js), multiple models (Sonnet 4.5, GPT-5), all OS platforms.
The team is investigating the source and scope of the contamination. I’ll add your report to the existing thread so everything stays in one place.