GHSA-253c-mchw-3w2r: markdown-it

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

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 29 Sept 2026, 17:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
markdown-it	npm	>=15.0.0, <15.0.1 \|\| <14.3.1	15.0.1, 14.3.1

Identifiers

GHSA-253c-mchw-3w2r

Weakness (CWE)

CWE-400 · CWE-407

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

Score	Rating	CVSS	Vector	Source
Not published	None	4.0	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	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

29 Sept 2026, 17:57 UTC Confirmed by GitHub Advisory Database
31 Oct 2026, 13:34 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.