Description
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.
Published: 2026-10-08
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 08 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 08 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser
First Time appeared Thephpleague
Thephpleague commonmark
Weaknesses CWE-400
CPEs cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:*
Vendors & Products Thephpleague
Thephpleague commonmark
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Thephpleague Commonmark
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-08T17:03:50.815Z

Reserved: 2026-10-05T21:59:09.591Z

Link: CVE-2026-105830

cve-icon Vulnrichment

Updated: 2026-10-08T17:03:25.566Z

cve-icon NVD

Status : Received

Published: 2026-10-08T15:17:35.340

Modified: 2026-10-08T17:17:12.843

Link: CVE-2026-105830

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-08T18:45:17Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption