CVE-2026-105830

HIGH 7.5

league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

league/commonmark from 2.0.0 before 2.10.2 contains a quadratic-time denial of service vulnerability in the GitHub Flavored Markdown Table extension's TableStartParser::tryStart() block-start scan. Unauthenticated attackers can submit a large paragraph of pipe-free lines not starting with letters, forcing repeated full-buffer strpos scans that exhaust PHP worker CPU.

CWE	CWE-400
Vendor	thephpleague
Product	commonmark
Published	Oct 8, 2026
Last Updated	Oct 8, 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

2.0.0 < 2.10.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8 vulncheck.com: https://www.vulncheck.com/advisories/league-commonmark-2.0.0-before-2.10.2-quadratic-dos-via-tablestartparser

Credits

🔍 manus-pi 🔍 manus-use