# CVE-2026-105829: php-league-commonmark: League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Ma...

CVE-2026-105829 is fixed in php-league-commonmark on 1 platform by DEBIAN-CVE-2026-105829 (version 2.10.3-1), released October 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-105829
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 8, 2026

## Description

League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <iframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | php-league-commonmark Debian 14 | 2.10.3-1 | [DEBIAN-CVE-2026-105829](https://patchblox.com/security/data/fix/linux/debian-cve-2026-105829.md) | Oct 10, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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