What’s Vulnerable › Vulnerabilities

CVE-2023-26302: markdown-it-py CLI crash on invalid UTF-8 characters

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-22 · updated 2026-06-17
• Weakness: CWE-173

Description

Denial of service could be caused to the command line interface of markdown-it-py, before v2.2.0, if an attacker was allowed to use invalid UTF-8 characters as input.

Affected products

• Executable Books markdown-it-py: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: Executable Books markdown-it-py 2.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/executablebooks/markdown-it-py/commit/53ca3e9c2b9e9b295f6abf7f4ad2730a9b70f68c
• https://github.com/executablebooks/markdown-it-py/commit/53ca3e9c2b9e9b295f6abf7f4ad2730a9b70f68c

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