Algorithmic Complexity Affecting mistune package, versions *


Severity

Recommended
0.0
high
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.41% (35th percentile)

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  • Snyk IDSNYK-DEBIAN12-MISTUNE-21602959
  • published23 Oct 2026
  • disclosed22 Oct 2026

Introduced: 22 Oct 2026

NewCVE-2026-115347  (opens in a new tab)
CWE-407  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 mistune.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mistune package and not the mistune package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.

CVSS Base Scores

version 3.1