CVE-2026-115348
Deferred Deferred - Pending Action

Algorithm Complexity in Mistune Markdown Parser

Publication date: 2026-10-22

Last updated on: 2026-10-22

Assigner: VulnCheck

Description
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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Meta Information

Published
2026-10-22
Last Modified
2026-10-22
Generated
2026-10-23
EPSS Evaluated
N/A
NVD
CVE-2026-115348

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
lepture mistune 3.0.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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