CVE-2026-115347 — Mistune before 3.3.0 Quadratic Denial of Service via parse_link_text
Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced s…
Published: 2026-10-22 · CVSS: 8.7 · CVSS 4.0
Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7