# Markdown-It vulnerabilities

Source: https://junglewise.ai/threats/technologies/markdown-it-markdown-it  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/markdown-it-markdown-it.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Markdown-It: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-111758, was published on 20 October 2026. 2 vulnerabilities in the last four weeks, up 100% on the four before (1).

## Counts

- Last 7 days: 0
- Last 30 days: 2
- Last 90 days: 3
- All time: 3 (0 critical, 0 exploited in the wild)

## About Markdown-It

JavaScript library that parses Markdown text into HTML with support for plugins and custom rules.

## Latest Markdown-It vulnerabilities

- [CVE-2026-111758: markdown-it quadratic-time rendering of unclosed link reference](https://junglewise.ai/threats/cve-2026-111758-markdown-it-quadratic-time-rendering-of-a-single-multi-line-link) (high, CVSS 7.5, published 20 Oct 2026)
- [CVE-2026-111759: markdown-it quadratic ReDoS in smartquotes](https://junglewise.ai/threats/cve-2026-111759-markdown-it-is-a-markdown-parser-prior-to-14-3-2-and-15-0-2-when) (high, CVSS 7.5, published 19 Oct 2026)
- [markdown-it quadratic performance degradation in linkify processing](https://junglewise.ai/threats/markdown-it-linkify-true-has-two-quadratic-paths-so-a-few-hundred-kb-of-a1cf8480) (medium, published 29 Sep 2026)

## Most severe Markdown-It vulnerabilities

- [CVE-2026-111759: markdown-it quadratic ReDoS in smartquotes](https://junglewise.ai/threats/cve-2026-111759-markdown-it-is-a-markdown-parser-prior-to-14-3-2-and-15-0-2-when) (high, CVSS 7.5, published 19 Oct 2026)
- [CVE-2026-111758: markdown-it quadratic-time rendering of unclosed link reference](https://junglewise.ai/threats/cve-2026-111758-markdown-it-quadratic-time-rendering-of-a-single-multi-line-link) (high, CVSS 7.5, published 20 Oct 2026)
- [markdown-it quadratic performance degradation in linkify processing](https://junglewise.ai/threats/markdown-it-linkify-true-has-two-quadratic-paths-so-a-few-hundred-kb-of-a1cf8480) (medium, published 29 Sep 2026)

## Vulnerabilities per week

2 vulnerabilities in the last four weeks, up 100% on the four before (1).

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 1 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 2 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Markdown-It vulnerabilities", https://junglewise.ai/threats/technologies/markdown-it-markdown-it, 9 November 2026.