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Vulnerabilities

Vulnerability · CVE-2026-59927

Mistune is a Python Markdown parser with renderers and plugins.

Published Jul 8, 2026 · catalog updated Oct 1, 2026 · Mistune is a Python

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-59927. EPSS is 0.53%. Act only if a listed version of Mistune is a Python is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Mistune is a Python).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.53%
Remediation
Advisory link
Affected products
Debian:12 mistune · Debian:13 mistune · Debian:14 mistune

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 mistune2.0.4-1, 2.0.4-2, 3.0.2-1
  • Debian:13 mistune3.1.3-1, 3.1.4-1, 3.3.4-1
  • Debian:14 mistune3.1.3-1, 3.1.4-1, 3.3.4-1

How to fix CVE-2026-59927

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-59927. EPSS is 0.53%. Act only if a listed version of Mistune is a Python is installed.

Which versions are affected?

Compare what you have installed with 2.0.4-1, 2.0.4-2, 3.0.2-1, 3.1.3-1, 3.1.4-1, 3.3.4-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 1, 2026 · Trivy Vulnerability DB

    Updated

    Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.

  2. Oct 25, 2026 · Tenable CVE Database

    Detected

    Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.

Sources

  • CVE.orgVulnerability recordCVE-2026-59927

    Official CVE identifier

    cve.org
  • Tenable CVE DatabaseVulnerability recordCVE-2026-59927

    Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.

    tenable.com
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-59927

    Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion

    osv.dev

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Trivy Vulnerability DBOct 26, 2026
  • CVE.orgOct 26, 2026
  • Tenable CVE DatabaseOct 26, 2026