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CVE-2026-86432 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/thephpleague/commonmark/security/advisories/GHSA-mj63-m3rc-8ppr	[email protected]
https://www.vulncheck.com/advisories/commonmark-2.0.0-before-2.8.4-denial-of-service-via-xml	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-405	Asymmetric Resource Consumption (Amplification)	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 10, 2026	CVE Modified	CISA-ADP
Sep 7, 2026	New CVE Received	[email protected]