CVE-2026-115352
High · 7.5CVSS
7.5
EPSS
0.4%
Published
Oct 22, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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