{"id":"CVE-2026-86432","title":"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","summary":"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 qua…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-405"],"vendor":"thephpleague","product":"commonmark","affected":["commonmark >= 2.0.0 < 2.8.4"],"published":"2026-09-07","updated":"2026-09-10","sourceUpdated":"2026-09-10T16:18:02.793","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86432","references":[{"url":"https://github.com/thephpleague/commonmark/security/advisories/GHSA-mj63-m3rc-8ppr","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/commonmark-2.0.0-before-2.8.4-denial-of-service-via-xml","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-10T14:22:38.482490Z"},"epss":0.00247,"epssPercentile":0.1628,"ingestedAt":"2026-09-08T20:10:03.179Z","slug":"CVE-2026-86432","body":"## Overview\n\ncommonmark 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}