# league/commonmark (Packagist) vulnerabilities Source: https://junglewise.ai/threats/technologies/league-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/league-commonmark.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 18 vulnerabilities in league/commonmark (Packagist): 0 in the last 7 days and 7 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: 7 - All time: 18 (0 critical, 0 exploited in the wild) ## About league/commonmark (Packagist) A PHP Markdown parser for the CommonMark specification. ## Latest league/commonmark (Packagist) 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-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-2026-86431: 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-2026-33347: league/commonmark has an embed extension allowed_domains bypass](https://junglewise.ai/threats/cve-2026-33347-league-commonmark-has-an-embed-extension-allowed-domains-bypass) (medium, CVSS 4, published 19 Mar 2026) - [CVE-2026-30838: CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag names](https://junglewise.ai/threats/cve-2026-30838-commonmark-has-disallowedrawhtml-extension-bypass-via-whitespace) (medium, CVSS 4, published 6 Mar 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) - [CVE-2018-20583: PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)](https://junglewise.ai/threats/cve-2018-20583-php-league-commonmark-vulnerable-to-cross-site-scripting-xss) (low, CVSS 3, published 14 May 2022) - [CVE-2019-10010: Moderate severity vulnerability that affects league/commonmark](https://junglewise.ai/threats/cve-2019-10010-moderate-severity-vulnerability-that-affects-league-commonmark) (low, CVSS 3, published 17 Sep 2019) ## Most severe league/commonmark (Packagist) 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-2026-86430: 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) - [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) - [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-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) ## 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 | 5 | 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 | ## Other Packagist technologies - [moodle/moodle (Packagist)](https://junglewise.ai/threats/technologies/moodle-moodle): 434 vulnerabilities - [magento/community-edition (Packagist)](https://junglewise.ai/threats/technologies/packagist-magento-community-edition): 362 vulnerabilities - [typo3/cms (Packagist)](https://junglewise.ai/threats/technologies/packagist-typo3-cms): 187 vulnerabilities - [wwbn/avideo (Packagist)](https://junglewise.ai/threats/technologies/wwbn-avideo): 164 vulnerabilities - [magento/project-community-edition (Packagist)](https://junglewise.ai/threats/technologies/magento-project-community-edition): 161 vulnerabilities - [drupal/core (Packagist)](https://junglewise.ai/threats/technologies/packagist-drupal-core): 150 vulnerabilities - [pimcore/pimcore (Packagist)](https://junglewise.ai/threats/technologies/pimcore-pimcore): 145 vulnerabilities - [craftcms/cms (Packagist)](https://junglewise.ai/threats/technologies/craftcms-cms): 143 vulnerabilities - [dolibarr/dolibarr (Packagist)](https://junglewise.ai/threats/technologies/dolibarr-dolibarr): 127 vulnerabilities - [getgrav/grav (Packagist)](https://junglewise.ai/threats/technologies/getgrav-grav): 127 vulnerabilities - [typo3/cms-core (Packagist)](https://junglewise.ai/threats/technologies/typo3-cms-core): 127 vulnerabilities - [concrete5/concrete5 (Packagist)](https://junglewise.ai/threats/technologies/concrete5-concrete5): 122 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, "league/commonmark (Packagist) vulnerabilities", https://junglewise.ai/threats/technologies/league-commonmark, 9 November 2026.