Security Advisory
CVE-2026-86435
CVSS 7.5
HIGH
Vulnerability Description
commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Footnote extension that fails to deduplicate footnote definitions. Attackers can craft documents with duplicate footnote definitions and references to create quadratic output expansion, consuming excessive memory and CPU to exhaust server resources.
Published Date
2026-09-07T13:20:43.013
Data Feed
NIST National Vulnerability Database