markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)
markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3.
CVE-2026-111758
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-111758
markdown-it
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "markdown-it",
"product": "markdown-it",
"versions": [
{
"status": "affected",
"version": ">= 14.1.0, < 14.3.3"
},
{
"status": "affected",
"version": ">= 15.0.0, < 15.0.3"
}
]
}
]- Related CVEs
- CVE-2026-111758
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #42627 · Revision 1
- Added to Heist Feed
- Publisher date