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Home/ Questions/Q 6770337
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T15:18:01+00:00 2026-05-26T15:18:01+00:00

What Unicode characters (more precisely codepoints) are dangerous and should be blacklisted and prohibited

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What Unicode characters (more precisely codepoints) are dangerous and should be blacklisted and prohibited for the users to use?
I know that BIDI override characters and the “zero width space” are very prone to make problems, but what others are there?

Thanks

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  1. Editorial Team
    Editorial Team
    2026-05-26T15:18:02+00:00Added an answer on May 26, 2026 at 3:18 pm

    Characters aren’t dangerous: only inappropriate uses of them are.

    You might consider reading things like:

    • Unicode Standard Annex #31: Unicode Identifier and Pattern Syntax
    • RFC 3454: Preparation of Internationalized Strings (“stringprep”)

    It is impossible to guess what you mean by dangerous.

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