[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
markdown-it	14.2.0 → 14.3.1

---

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

GHSA-253c-mchw-3w2r

More information

Details

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
'a@b.co\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 ('a@b.co ') takes 0.59s, one email per paragraph ('a@b.co\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 a@b.co 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.

Severity

• CVSS Score: 6.3 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-253c-mchw-3w2r
• https://github.com/markdown-it/markdown-it/commit/09fa07118dda4c953f058848f53dae88395618ca
• https://github.com/markdown-it/markdown-it/commit/aaadcfa6d817b3c5f89afb49d97c7b797a6dd4fd
• https://github.com/markdown-it/markdown-it/commit/ad70f6b7cff64bee10e42a774147112480ca0d49
• https://github.com/advisories/GHSA-253c-mchw-3w2r

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Release Notes

markdown-it/markdown-it (markdown-it)

v14.3.1

Compare Source

v14.3.0

Compare Source

Changed

• Reworked build pipeline & tools.
• Added source maps.
• Bumped linkify-it to 5.0.2.

Fixed

• Preserve backslash-space hard line breaks, matching CommonMark 6.7, #​1185.

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
editor	Ready	Preview	Oct 3, 2026 2:15am UTC