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Fix ReDoS in HtmlParser URL evaluation#134

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dlukt merged 1 commit into
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fix-redos-url-parsing-16219277335071236597
Jun 29, 2026
Merged

Fix ReDoS in HtmlParser URL evaluation#134
dlukt merged 1 commit into
masterfrom
fix-redos-url-parsing-16219277335071236597

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@dlukt

@dlukt dlukt commented Jun 29, 2026

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Fixes a bug where writing or displaying a status containing a complex URL structure would cause the app to hang/crash due to a catastrophic backtracking ReDoS vulnerability in com.twitter.twittertext.Regex.

By applying safe repetition length boundaries ({0,2000} and {0,100}) to the URL_VALID_PATH regex component instead of using unbounded * repetitions, the parser can efficiently evaluate and drop invalid links without exponential backtracking.


PR created automatically by Jules for task 16219277335071236597 started by @dlukt

Replace unbounded repetitions `*` with length boundaries `{0,2000}`
and `{0,100}` in `URL_VALID_PATH` to prevent catastrophic backtracking
(ReDoS) when parsing complex text blocks containing overlapping characters.

Co-authored-by: dlukt <201112286+dlukt@users.noreply.github.com>
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@dlukt dlukt merged commit c191545 into master Jun 29, 2026
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