CM-68330: fix hook payload handling on Cursor for Windows - #491
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Ilanlido merged 1 commit intoJul 8, 2026
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Two payload bugs found in Windows/Cursor MDM testing:
- Cursor sends the hook payload with a UTF-8 BOM; json.loads rejects it and
safe_json_parse returned {}, silently allowing without scanning. Read stdin
bytes and decode utf-8-sig at both hook entry points - strips the BOM and
pins the payload to UTF-8 regardless of the Windows ANSI code page (non-ASCII
prompts were mojibake under cp1252). The text-mode fallback path lstrips
U+FEFF as defense-in-depth.
- Cursor sends workspace_roots=[] when no folder is open; the .get() default
only applies when the key is missing, so workspace_roots[0] raised
IndexError. Fall back to '.' via `or`.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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omer-roth
approved these changes
Jul 8, 2026
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Two payload bugs found in Windows/Cursor MDM testing:
Cursor sends the hook payload with a UTF-8 BOM; json.loads rejects it and safe_json_parse returned {}, silently allowing without scanning. Read stdin bytes and decode utf-8-sig at both hook entry points - strips the BOM and pins the payload to UTF-8 regardless of the Windows ANSI code page (non-ASCII prompts were mojibake under cp1252). The text-mode fallback path lstrips U+FEFF as defense-in-depth.
Cursor sends workspace_roots=[] when no folder is open; the .get() default only applies when the key is missing, so workspace_roots[0] raised IndexError. Fall back to '.' via or.