CVE-2024-58382

High

Description

league/commonmark versions before 2.6.0 contain polynomial time complexity vulnerabilities in Markdown parsing that allow attackers to cause denial of service. Attackers can submit carefully crafted Markdown inputs designed to trigger worst-case performance, and sending multiple requests in parallel exhausts CPU resources and PHP-FPM processes.

SeverityHigh

CVSS7.5

Exploit probability—

ProductLeague/commonmark

PublishedSep 9, 2026

First seenSep 9, 2026

Weakness typeCWE-407CWE-407

How to fix

Update

league/commonmark2.6.0 or later

Vendor advisories

github.com/thephpleague/commonmark/security/advisories/GHSA-c2pc-g5qf-rfrf

Affected products

Product	Affected versions	Fixed in
league/commonmarkPackagist	v < 2.6.0	2.6.0

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