markdown-it linkify: true has two quadratic paths, so a few hundred KB of markdown blocks the event loop for tens of seconds

Summary

Two independent quadratic paths in the linkify: true handling. Both are in markdown-it's own code rather than in linkify-it, which stays linear on both payloads.

src/rules_core/linkify.ts calls arrayReplaceAt once per linkified text token, and that rebuilds the whole children array each time. A paragraph of N soft-broken lines is one inline token with about 2N children, so you get N rebuilds over a 2N array. Schema-less emails are what reach it. A http:// link gets consumed by the inline rule first and never arrives as a text token, so those stay linear.

src/rules_inline/linkify.ts runs state.pending.match(SCHEME_RE) at every :// in the source. state.pending only gets truncated once a link is actually produced, so an unregistered scheme leaves it growing and every :// rescans the lot.

Proof of concept

Clean install of 15.0.0 from npm, new MarkdownIt({ linkify: true }).render(payload), Node 24.

N	5,000	10,000	20,000	40,000
'[email protected]\n'.repeat(N), 34KB to 273KB	1.1s	4.7s	19.6s	89s
'a://'.repeat(N), 20KB to 156KB	0.25s	0.76s	3.1s	15.0s

Doubling the input roughly quadruples the time in both. With linkify: false the same inputs run in 25 to 131ms and stay flat.

Controls for the first one, all at N=20000: putting every email in a single text token ('[email protected] ') takes 0.59s, one email per paragraph ('[email protected]\n\n') takes 0.64s, and soft-broken lines with nothing linkifiable take 42ms. So it needs many children AND many of them linkifying. For the second, replaying just the SCHEME_RE calls against the same growing prefixes with no markdown-it involved accounts for 11.7s of the 15s.

Ordinary prose does it too. 'ping [email protected] ok\n'.repeat(20000) is 293KB and takes 31s.

Caveat

linkify is off by default, so this only reaches apps that turn it on.

Impact

Availability only. A few hundred KB of fairly ordinary markdown pins one core for tens of seconds, and because it's quadratic it degrades quickly with size. Nothing is read, written or executed.