Agent bleed with someone else's codebase?

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Auto agent testing a feature using @browser, paused for a while then started doing things completely unrelated to my NextJS app:

“Creating the Flask CSV duplicate finder app with download functionality:” and referencing .py files

e399e501-6c90-407f-8cbe-b79f13100006

Steps to Reproduce

one-off issue

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

2.0.54
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Does this stop you from using Cursor

Yes - Cursor is unusable

2

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:

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.

1 Like
3

@deanrie I think I can trigger this behaviour, if that’s useful.

If I tag the @browser to monitor the UI, and ask it to iterate until it’s right, it goes into the flask app issue.

1 Like
4

Thanks for the info, that’s very helpful.

1 Like