CVE-2026-115352 — Mistune before 3.3.0 Quadratic-Time DoS via Unmatched Brackets in Inline Parser
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 u…
Published: 2026-10-22 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 0bfcb4a0db026bd19929694234eddc30870130af