MEDIUM 6.9 NVD
CVE-2026-86432
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
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.
References
- https://github.com/thephpleague/commonmark/security/advisories/GHSA-mj63-m3rc-8ppr
- https://www.vulncheck.com/advisories/commonmark-2.0.0-before-2.8.4-denial-of-service-via-x
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-09-07 via NVD.
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