# Markdown-It vulnerabilities Source: https://junglewise.ai/threats/vendors/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/vendors/markdown-it.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 9 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). 1 technology has a page of its own. ## Counts - Last 7 days: 0 - Last 30 days: 2 - Last 90 days: 3 - All time: 9 (0 critical, 0 exploited in the wild) ## About Markdown-It JavaScript project providing a markdown parser and renderer library with extensible plugin support. ## 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) - [CVE-2026-48801: markdown-it linkify-it Denial of Service via Quadratic Complexity in match loop](https://junglewise.ai/threats/cve-2026-48801-markdown-it-linkify-it-denial-of-service-via-quadratic-complexity) (high, CVSS 4, published 14 Jul 2026) - [CVE-2026-59887: markdown-it linkify-it quadratic complexity DoS in mailto validator](https://junglewise.ai/threats/cve-2026-59887-markdown-it-linkify-it-quadratic-complexity-dos-in-mailto) (high, CVSS 7.5, published 8 Jul 2026) - [CVE-2026-48988: markdown-it denial of service in smartquotes rule](https://junglewise.ai/threats/cve-2026-48988-markdown-it-denial-of-service-in-smartquotes-rule) (medium, CVSS 5.3, published 17 Jun 2026) - [CVE-2026-2327: markdown-it ReDoS in linkify regex](https://junglewise.ai/threats/cve-2026-2327-markdown-it-redos-in-linkify-function) (low, CVSS 3.1, published 12 Feb 2026) - [CVE-2015-10005: markdown-it inefficient regular expression complexity](https://junglewise.ai/threats/cve-2015-10005-markdown-it-inefficient-regular-expression-complexity) (low, CVSS 3.1, published 27 Dec 2022) - [CVE-2022-21670: markdown-it denial of service via regex backtracking](https://junglewise.ai/threats/cve-2022-21670-markdown-it-denial-of-service-via-regex-backtracking) (low, CVSS 3.1, published 12 Jan 2022) ## Most severe Markdown-It vulnerabilities - [CVE-2026-59887: markdown-it linkify-it quadratic complexity DoS in mailto validator](https://junglewise.ai/threats/cve-2026-59887-markdown-it-linkify-it-quadratic-complexity-dos-in-mailto) (high, CVSS 7.5, published 8 Jul 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) - [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-2026-48801: markdown-it linkify-it Denial of Service via Quadratic Complexity in match loop](https://junglewise.ai/threats/cve-2026-48801-markdown-it-linkify-it-denial-of-service-via-quadratic-complexity) (high, CVSS 4, published 14 Jul 2026) - [CVE-2026-48988: markdown-it denial of service in smartquotes rule](https://junglewise.ai/threats/cve-2026-48988-markdown-it-denial-of-service-in-smartquotes-rule) (medium, CVSS 5.3, published 17 Jun 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) - [CVE-2022-21670: markdown-it denial of service via regex backtracking](https://junglewise.ai/threats/cve-2022-21670-markdown-it-denial-of-service-via-regex-backtracking) (low, CVSS 3.1, published 12 Jan 2022) - [CVE-2015-10005: markdown-it inefficient regular expression complexity](https://junglewise.ai/threats/cve-2015-10005-markdown-it-inefficient-regular-expression-complexity) (low, CVSS 3.1, published 27 Dec 2022) - [CVE-2026-2327: markdown-it ReDoS in linkify regex](https://junglewise.ai/threats/cve-2026-2327-markdown-it-redos-in-linkify-function) (low, CVSS 3.1, published 12 Feb 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 | ## Markdown-It technologies - [Markdown-It](https://junglewise.ai/threats/technologies/markdown-it-markdown-it): 3 vulnerabilities ## 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/vendors/markdown-it, 9 November 2026.