High severity7.5NVD Advisory· Published Oct 22, 2026· Updated Oct 22, 2026
CVE-2026-115352
CVE-2026-115352
Description
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.
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Affected products
1Patches
Vulnerability mechanics
References
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