SEPTEMBER 17, 2026
Live Feed
Back to database
Case File

CVE-2026-86435

HIGH · CVSS 7.5 EPSS 0.28% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-07 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Commonmark versions prior to 2.8.4 are vulnerable to a denial of service attack via the Footnote extension, which improperly handles duplicate footnote definitions. This flaw allows attackers to create documents that lead to excessive memory and CPU consumption, potentially exhausting server resources and disrupting service. Organizations using affected versions should prioritize patching to mitigate the risk of service disruption.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-86435
Severity
HIGH
CVSS
7.5
EPSS
0.28%

Original NVD 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.