How severe is CVE-2026-59924?

CVE-2026-59924 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-59924 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-59924?

CVE-2026-59924 affects Mistune Project Mistune. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-59924?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-59924 published?

CVE-2026-59924 was published on 2026-07-08 and last updated on 2026-07-09.

CVE-2026-59924

CVE-2026-59924 is a medium-severity vulnerability in Mistune Project Mistune with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Mistune Project Mistune
Published: 2026-07-08
Last modified: 2026-07-09

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.

Frequently asked questions

What is CVE-2026-59924?: Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.
How severe is CVE-2026-59924?: CVE-2026-59924 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-59924 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-59924?: CVE-2026-59924 affects Mistune Project Mistune. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-59924?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-59924 published?: CVE-2026-59924 was published on 2026-07-08 and last updated on 2026-07-09.

References

Affected products (1)

cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*

More vulnerabilities in Mistune Project Mistune

CVE-2026-59928 — High (CVSS 7.5): Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing many…
CVE-2026-59925 — High (CVSS 7.5): Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, long sequences of well-formed…
CVE-2026-59922 — High (CVSS 7.5): Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or…
CVE-2022-34749 — High (CVSS 7.5): In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high…
CVE-2026-59929 — Medium (CVSS 6.1): Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in…
CVE-2026-59926 — Medium (CVSS 6.1): Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in…

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