Bug 2559376 (CVE-2026-115348) - CVE-2026-115348 mistune: mistune: Denial of Service via unbalanced brackets in link parser
Summary: CVE-2026-115348 mistune: mistune: Denial of Service via unbalanced brackets i...
Keywords:
Status: NEW
Alias: CVE-2026-115348
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: 2560067 2560069 2560071 2560073 2560075 2560077 2560078
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-22 20:56 UTC by OSIDB Bzimport
Modified: 2026-10-23 17:28 UTC (History)
15 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-10-22 20:56:00 UTC 
Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's parse_link_text function that allows unauthenticated attackers to exhaust CPU with unbalanced brackets. Attackers can submit Markdown containing many unbalanced '[' or '![' characters, forcing repeated unbounded forward scans and tying up worker processes for minutes.
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