league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code block detection, reference link label lookup, and emphasis delimiter processing that perform super-linear work on crafted input. Attackers can submit specially crafted Markdown with long backtick runs, nested brackets, or delimiter sequences to consume disproportionate CPU time and prevent legitimate requests from completing.
Metrics
Affected Vendors & Products
References
History
Thu, 08 Oct 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Mon, 07 Sep 2026 13:00:00 +0000
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| Description | league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code block detection, reference link label lookup, and emphasis delimiter processing that perform super-linear work on crafted input. Attackers can submit specially crafted Markdown with long backtick runs, nested brackets, or delimiter sequences to consume disproportionate CPU time and prevent legitimate requests from completing. | |
| Title | league/commonmark before 2.9.1 Denial of Service via parsing | |
| First Time appeared |
Thephpleague
Thephpleague commonmark |
|
| Weaknesses | CWE-407 | |
| CPEs | cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Thephpleague
Thephpleague commonmark |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-07T12:53:50.575Z
Updated: 2026-10-08T15:25:52.185Z
Reserved: 2026-09-07T12:34:31.457Z
Link: CVE-2026-86430
Updated: 2026-09-09T14:31:12.903Z
Status : Analyzed
Published: 2026-09-07T13:20:42.320
Modified: 2026-10-08T16:17:57.177
Link: CVE-2026-86430
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