HIGH 8.7 NVD
CVE-2026-115352
Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows unauthenticated attackers to exhaust CPU by submitti
Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows unauthenticated attackers to exhaust CPU by submitting long runs of unmatched '[' characters. Attackers can send small markdown payloads that trigger O(N^2) parse_link_text and parse_link_label probing, occupying rendering workers for 30+ seconds per 16 KB input.
References
- https://github.com/lepture/mistune/security/advisories/GHSA-xrpv-r66x-8p7j
- https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-time-dos-via-unmatched
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-22 via NVD.
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