HIGH 8.7 NVD
CVE-2026-115347
Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service thr
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.
References
- https://github.com/lepture/mistune/security/advisories/GHSA-f32h-38gf-rg5r
- https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-denial-of-service-via-
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-22 via NVD.
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