Bug 2559293 (CVE-2026-115352) - CVE-2026-115352 mistune: mistune: Denial of Service via unmatched brackets in inline link parser
Summary: CVE-2026-115352 mistune: mistune: Denial of Service via unmatched brackets in...
Keywords:
Status: NEW
Alias: CVE-2026-115352
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2560117 2560118 2560119 2560120 2560121 2560122 2560123
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-22 20:15 UTC by OSIDB Bzimport
Modified: 2026-10-23 17:44 UTC (History)
15 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-10-22 20:15:51 UTC 
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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