# The PHP League CommonMark vulnerabilities

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

Junglewise Threat Intelligence has tracked 16 vulnerabilities in The PHP League CommonMark: 0 in the last 7 days and 9 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2024-58382, was published on 9 September 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 9
- All time: 16 (0 critical, 0 exploited in the wild)

## About The PHP League CommonMark

A PHP Markdown parser library compliant with CommonMark and GitHub Flavored Markdown specifications.

## Latest The PHP League CommonMark vulnerabilities

- [CVE-2024-58382: league/commonmark polynomial time complexity denial of service](https://junglewise.ai/threats/cve-2024-58382-league-commonmark-polynomial-time-complexity-denial-of-service) (high, CVSS 7.5, published 9 Sep 2026)
- [CVE-2026-86435: commonmark Footnote extension denial of service](https://junglewise.ai/threats/cve-2026-86435-commonmark-footnote-extension-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)
- [CVE-2026-86432: commonmark XmlRenderer denial of service via nested XML indentation](https://junglewise.ai/threats/cve-2026-86432-commonmark-xmlrenderer-denial-of-service-via-nested-xml) (medium, CVSS 5.3, published 7 Sep 2026)
- [CVE-2026-86431: league/commonmark AttributesExtension XSS bypass with U+000C](https://junglewise.ai/threats/cve-2026-86431-league-commonmark-attributesextension-xss-bypass-with-u-000c) (high, CVSS 7.2, published 7 Sep 2026)
- [CVE-2026-86430: league/commonmark denial of service in parsing](https://junglewise.ai/threats/cve-2026-86430-league-commonmark-denial-of-service-in-parsing) (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-2026-86428: commonmark denial of service in AttributesExtension](https://junglewise.ai/threats/cve-2026-86428-commonmark-denial-of-service-in-attributesextension) (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)
- [CVE-2026-71478: thephpleague commonmark XSS bypass in AttributesExtension](https://junglewise.ai/threats/cve-2026-71478-thephpleague-commonmark-xss-bypass-in-attributesextension) (medium, CVSS 6.1, published 6 Aug 2026)
- [thephpleague commonmark denial of service in XmlRenderer](https://junglewise.ai/threats/thephpleague-commonmark-denial-of-service-in-xmlrenderer-99533992) (medium, CVSS 5.3, published 6 Aug 2026)
- [thephpleague commonmark denial of service in UniqueSlugNormalizer](https://junglewise.ai/threats/thephpleague-commonmark-denial-of-service-in-uniqueslugnormalizer-94ab233b) (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 The PHP League CommonMark 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)
- [CVE-2026-86435: commonmark Footnote extension denial of service](https://junglewise.ai/threats/cve-2026-86435-commonmark-footnote-extension-denial-of-service) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-86430: league/commonmark denial of service in parsing](https://junglewise.ai/threats/cve-2026-86430-league-commonmark-denial-of-service-in-parsing) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2026-86428: commonmark denial of service in AttributesExtension](https://junglewise.ai/threats/cve-2026-86428-commonmark-denial-of-service-in-attributesextension) (high, CVSS 7.5, published 7 Sep 2026)
- [CVE-2024-58382: league/commonmark polynomial time complexity denial of service](https://junglewise.ai/threats/cve-2024-58382-league-commonmark-polynomial-time-complexity-denial-of-service) (high, CVSS 7.5, published 9 Sep 2026)
- [thephpleague commonmark denial of service in UniqueSlugNormalizer](https://junglewise.ai/threats/thephpleague-commonmark-denial-of-service-in-uniqueslugnormalizer-94ab233b) (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)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| 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 | 9 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 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, "The PHP League CommonMark vulnerabilities", https://junglewise.ai/threats/technologies/commonmark, 9 November 2026.