CVE-2026-86432: Asymmetric Resource Consumption (Amplification) in thephpleague commonmark
commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in XmlRenderer that emits depth-proportional indentation for every XML tag. Attackers can provide deeply nested Markdown or AST structures to cause quadratic memory consumption and output amplification, exhausting server resources.
CVE-2026-86432: Asymmetric Resource Consumption (Amplification) in thephpleague commonmark
Description
commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in XmlRenderer that emits depth-proportional indentation for every XML tag. Attackers can provide deeply nested Markdown or AST structures to cause quadratic memory consumption and output amplification, exhausting server resources.
CVSS v4.0
Score 6.9medium
Affected software
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-07T12:34:31.457Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9eb72cacd9273b49a9cf7a
Added to database: 09/07/2026, 13:07:56 UTC
Last updated: 09/07/2026, 13:07:56 UTC
Views: 1
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