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Advisory record · GHSA-gfr2-rv44-r23c

markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)

CVSS 7.5 HighEPSS 0.0055 · 46th percentile

Published by the GitHub Advisory Database at 20 Oct 2026, 20:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
markdown-itnpm>=14.1.0, <14.3.3 || >=15.0.0, <15.0.314.3.3, 15.0.3
Identifiers
GHSA-gfr2-rv44-r23c · CVE-2026-111758
Weakness (CWE)
CWE-400 · CWE-407
Tags
Published
20 Oct 2026
Updated
20 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The markdown-it npm package from 14.1.0 before 14.3.3, and from 15.0.0 before 15.0.3, is affected. An attacker who can submit Markdown text can send a link reference definition whose label or title is never closed and spans many lines; with default options, rendering takes quadratic time and can block the server's event loop. Upgrade to 14.3.3 or 15.0.3.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0055, the 46th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.