CVE-2024-58382

HIGH 7.5

league/commonmark before 2.6.0 Denial of Service via Quadratic Complexity

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-407
Vendor	thephpleague
Product	commonmark
Published	Sep 9, 2026
Last Updated	Sep 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

thephpleague / commonmark

0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/thephpleague/commonmark/security/advisories/GHSA-c2pc-g5qf-rfrf vulncheck.com: https://www.vulncheck.com/advisories/league-commonmark-before-2.6.0-denial-of-service-via-quadratic-complexity