CVE-2024-58382 league/commonmark before 2.6.0 Denial of Service via Quadratic Complexity
Attackers can cause denial of service by submitting crafted Markdown inputs that trigger quadratic complexity in the league/commonmark PHP library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-58382?
CVE-2024-58382 is a high-severity denial of service vulnerability in thephpleague commonmark, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-407
Which versions are affected by CVE-2024-58382?
2 open source packages ship an affected version, including league/commonmark.
| Package | Affected | Fixed in |
|---|---|---|
league/commonmark Packagist | All versions | 2.6.0 |
league/commonmark Packagist | All versions | 2.6.0 |
How do I fix CVE-2024-58382?
Upgrade league/commonmark to 2.6.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-58382 being exploited?
There is no known exploitation of CVE-2024-58382 in the wild and no public exploit code.
Sources
Also known as CLSA-2025-1766364770, DEBIAN-CVE-2024-58382, GHSA-c2pc-g5qf-rfrf, GHSA-fv22-86fq-c33q.