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Potential fix for code scanning alert no. 13: Information exposure through an exception - #728

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security-fixes
Oct 7, 2026
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tobixen merged 1 commit into
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@tobixen tobixen commented Oct 7, 2026 •

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Note: I did not write the text below, Github Copilot did on my behalf and without allowing me to review it. The file in question is an example file, already with a disclaimer at the top that the code has not been tested by the maintainer. The code is also likely to be far away from what's considered "best current practices" in 2026 and beyond. I will emphasize this in another commit.


Potential fix for https://github.com/python-caldav/caldav/security/code-scanning/13

The correct fix is to stop exposing exception content in API responses and replace it with a generic error payload, while preserving diagnostics in server logs. This keeps functionality (client still receives a 500 on failure) without leaking internals.

Best single fix in examples/google-flask.py:

  • Add Python standard logging import and configure a module logger.
  • In serve_calendar_ics, change the except Exception as ex: block to:
    • log the exception server-side using logger.exception(...) (includes traceback),
    • return a generic JSON error message (for example "An internal error has occurred"), with status 500.
  • No behavior changes to successful paths or endpoint contract besides safer error text.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

Github security review found issues with this exmample.  As it's only an example and not live code, it's considered to be a very low-priority security issue.  Also, the file i smost likely not up to 2026-standards, so I've added a big disclaimer.

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
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tobixen marked this pull request as ready for review October 7, 2026 23:20
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tobixen merged commit b8497e9 into master Oct 7, 2026
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