# League vulnerabilities

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

Junglewise Threat Intelligence has tracked 9 vulnerabilities in League: 0 in the last 7 days and 5 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, league/commonmark DisallowedRawHtml XSS bypass in tag parsing, was published on 30 September 2026. Nothing in the last four weeks, down from 2 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 5
- All time: 9 (0 critical, 0 exploited in the wild)

## About League

Organization that maintains open-source software projects including CommonMark and PHP League packages.

## Latest League vulnerabilities

- [league/commonmark DisallowedRawHtml XSS bypass in tag parsing](https://junglewise.ai/threats/league-commonmark-disallowedrawhtml-bypassed-when-a-disallowed-tag-name-cea607bc) (medium, CVSS 6.1, published 30 Sep 2026)
- [league/commonmark quadratic DoS in GitHub Flavored Markdown table parser](https://junglewise.ai/threats/league-commonmark-quadratic-time-denial-of-service-in-the-github-a4135205) (high, CVSS 7.5, published 30 Sep 2026)
- [CVE-2026-86434: league/commonmark denial of service via slug collision](https://junglewise.ai/threats/cve-2026-86434-league-commonmark-denial-of-service-via-slug-collision) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-86433: commonmark Attributes extension denial of service via quadratic parsing](https://junglewise.ai/threats/cve-2026-86433-commonmark-attributes-extension-denial-of-service-via-quadratic) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-86429: League CommonMark quadratic parsing complexity denial of service](https://junglewise.ai/threats/cve-2026-86429-league-commonmark-quadratic-parsing-complexity-denial-of-service) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-71488: league commonmark quadratic-time denial of service in Markdown parsing](https://junglewise.ai/threats/cve-2026-71488-league-commonmark-quadratic-time-denial-of-service-in-markdown) (high, CVSS 7.5, published 6 Aug 2026)
- [league commonmark denial of service in Footnote extension](https://junglewise.ai/threats/league-commonmark-denial-of-service-in-footnote-extension-90371ead) (high, CVSS 7.5, published 6 Aug 2026)
- [league/commonmark denial of service in AttributesExtension](https://junglewise.ai/threats/league-commonmark-denial-of-service-in-attributesextension-c631ba68) (high, CVSS 7.5, published 6 Aug 2026)
- [CVE-2025-46734: league/commonmark XSS in Attributes extension](https://junglewise.ai/threats/cve-2025-46734-league-commonmark-xss-in-attributes-extension) (medium, CVSS 6.4, published 5 May 2025)

## Most severe League vulnerabilities

- [CVE-2026-71488: league commonmark quadratic-time denial of service in Markdown parsing](https://junglewise.ai/threats/cve-2026-71488-league-commonmark-quadratic-time-denial-of-service-in-markdown) (high, CVSS 7.5, published 6 Aug 2026)
- [CVE-2026-86429: League CommonMark quadratic parsing complexity denial of service](https://junglewise.ai/threats/cve-2026-86429-league-commonmark-quadratic-parsing-complexity-denial-of-service) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-86434: league/commonmark denial of service via slug collision](https://junglewise.ai/threats/cve-2026-86434-league-commonmark-denial-of-service-via-slug-collision) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-86433: commonmark Attributes extension denial of service via quadratic parsing](https://junglewise.ai/threats/cve-2026-86433-commonmark-attributes-extension-denial-of-service-via-quadratic) (high, CVSS 7.5, published 7 Sep 2026)
- [league/commonmark quadratic DoS in GitHub Flavored Markdown table parser](https://junglewise.ai/threats/league-commonmark-quadratic-time-denial-of-service-in-the-github-a4135205) (high, CVSS 7.5, published 30 Sep 2026)
- [league commonmark denial of service in Footnote extension](https://junglewise.ai/threats/league-commonmark-denial-of-service-in-footnote-extension-90371ead) (high, CVSS 7.5, published 6 Aug 2026)
- [league/commonmark denial of service in AttributesExtension](https://junglewise.ai/threats/league-commonmark-denial-of-service-in-attributesextension-c631ba68) (high, CVSS 7.5, published 6 Aug 2026)
- [CVE-2025-46734: league/commonmark XSS in Attributes extension](https://junglewise.ai/threats/cve-2025-46734-league-commonmark-xss-in-attributes-extension) (medium, CVSS 6.4, published 5 May 2025)
- [league/commonmark DisallowedRawHtml XSS bypass in tag parsing](https://junglewise.ai/threats/league-commonmark-disallowedrawhtml-bypassed-when-a-disallowed-tag-name-cea607bc) (medium, CVSS 6.1, published 30 Sep 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 2 vulnerabilities in the four before.

| 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 | 3 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 2 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 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, "League vulnerabilities", https://junglewise.ai/threats/vendors/league, 9 November 2026.