Resource Exhaustion Affecting python313-mistune package, versions <3.1.3-160000.4.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.35% (28th percentile)

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  • Snyk IDSNYK-SLES1600-PYTHON313MISTUNE-17875322
  • published7 Jul 2026
  • disclosed29 Jun 2026

Introduced: 29 Jun 2026

CVE-2026-49851  (opens in a new tab)
CWE-400  (opens in a new tab)
CWE-407  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 python313-mistune to version 3.1.3-160000.4.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python313-mistune package and not the python313-mistune package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Mistune is vulnerable to a CPU exhaustion DoS due to superlinear (approximately O(n²)) behavior in parse_link_text. When parsing Markdown containing many consecutive [ characters, parse_link_text repeatedly scans the input using a regex search inside a loop. Each iteration re-scans a large portion of the remaining string, resulting in quadratic-time behavior. An attacker-controlled Markdown input can therefore trigger excessive CPU usage with a very small payload. This vulnerability is fixed in 3.3.0.

CVSS Base Scores

version 3.1