Medium severity5.3NVD Advisory· Published Sep 7, 2026

CVE-2026-86432

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Thephpleague/Commonmarkllm-fuzzy
Range: 2.0.0 <= x < 2.8.4

Patches

Vulnerability mechanics

References

github.com/thephpleague/commonmark/security/advisories/GHSA-mj63-m3rc-8pprnvd
www.vulncheck.com/advisories/commonmark-2.0.0-before-2.8.4-denial-of-service-via-xmlnvd

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cvss	0.345
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ransomware	0.000