high7.5
CVE-2026-86435
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.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Commonmark Versions From 1.5.0 | before 2.8.4 |
Versions were read from the advisory text. No structured product data has been published for this record yet.