# league/commonmark (Packagist) vulnerabilities

15 known vulnerabilities (7 high, 6 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://packagist.org/packages/league/commonmark

## Advisories (15)

### [CVE-2026-105830](https://cve.now/CVE-2026-105830): league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser

- Severity: High 8.7
- Published: Oct 8, 2026
- Affected: from 2.0.0, fixed in 2.10.2.

### [CVE-2026-105829](https://cve.now/CVE-2026-105829): League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass

- Severity: Medium 5.3
- Published: Oct 8, 2026
- Affected: from 1.3.0, fixed in 2.10.2.

### [CVE-2024-58382](https://cve.now/CVE-2024-58382): league/commonmark before 2.6.0 Denial of Service via Quadratic Complexity

- Severity: High 8.7
- Published: Sep 9, 2026
- Affected: fixed in 2.6.0.

### [CVE-2026-86434](https://cve.now/CVE-2026-86434): commonmark 2.0.0 through 2.8.3 Denial of Service via Slug Collision

- Severity: High 8.7
- Published: Sep 7, 2026
- Affected: from 2.0.0, fixed in 2.9.0.

### [CVE-2026-86431](https://cve.now/CVE-2026-86431): commonmark before 2.9.1 XSS via AttributesExtension form feed bypass

- Severity: Medium 6.9
- Published: Sep 7, 2026
- Affected: from 2.7.0, fixed in 2.9.1.

### [CVE-2026-86430](https://cve.now/CVE-2026-86430): league/commonmark before 2.9.1 Denial of Service via parsing

- Severity: High 8.7
- Published: Sep 7, 2026
- Affected: from 0.6.0, fixed in 2.9.1.

### [CVE-2026-86429](https://cve.now/CVE-2026-86429): commonmark before 2.9.1 Denial of Service via SmartPunct and Attributes

- Severity: High 8.7
- Published: Sep 7, 2026
- Affected: from 1.5.0, fixed in 2.9.1.

### [CVE-2026-86428](https://cve.now/CVE-2026-86428): commonmark 1.5.0 before 2.10.0 Denial of Service via Attributes

- Severity: High 8.7
- Published: Sep 7, 2026
- Affected: from 1.5.0, fixed in 2.10.0.

### [CVE-2026-71488](https://cve.now/CVE-2026-71488): league/commonmark: Quadratic-time denial of service when parsing crafted Markdown

- Severity: High 7.5
- Published: Aug 6, 2026
- Affected: from 0.6.0, fixed in 2.9.0.

### [CVE-2026-71478](https://cve.now/CVE-2026-71478): league/commonmark: AttributesExtension href/src unsafe-link filter bypass via embedded control bytes

- Severity: Medium 6.1
- Published: Aug 6, 2026
- Affected: from 1.5.0, fixed in 2.9.0.

### [CVE-2026-33347](https://cve.now/CVE-2026-33347): league/commonmark has an embed extension allowed\_domains bypass

- Severity: Medium 6.3
- Published: Mar 24, 2026
- Affected: from 2.3.0, fixed in 2.8.2.

### [CVE-2026-30838](https://cve.now/CVE-2026-30838): league/commonmark: DisallowedRawHtml extension bypass via whitespace in HTML tag names

- Severity: Medium 5.1
- Published: Mar 7, 2026
- Affected: from 2.0.0, fixed in 2.8.1.

### [CVE-2025-46734](https://cve.now/CVE-2025-46734): league/commonmark Cross-site Scripting vulnerability in Attributes extension

- Severity: Medium 6.4
- Published: May 5, 2025
- Affected: from 1.5.0, fixed in 2.7.0.

### [CVE-2019-10010](https://cve.now/CVE-2019-10010): Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library before 0.18.3 allows remote attackers to insert unsafe links…

- Severity: Unrated
- Published: Mar 24, 2019
- Affected: fixed in 0.18.3.

### [CVE-2018-20583](https://cve.now/CVE-2018-20583): Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote…

- Severity: Unrated
- Published: Dec 30, 2018
- Affected: from 0.15.6, fixed in 0.18.1.

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