CVE-2026-86432 [MEDIUM] – commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in X

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.