HIGH 8.7 NVD
CVE-2026-115349
Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. At
Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.
References
- https://github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243v
- https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nest
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-22 via NVD.
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