markdown-it-py Denial of Service vulnerability in the command line interface

MEDIUM 5.5CVE-2023-26302 · GHSA-jrwr-5x3p-hvc3 · PYSEC-2023-23 · Published 22/02/2023 · updated 17/06/2026

In short

CVE-2023-26302 is a MEDIUM (CVSS 5.5) vulnerability affecting markdown-it-py, markdown-it-py (executablebooks).
Chance of exploitation in the next 30 days (EPSS): 0.22%, higher than 13.3% of all vulnerabilities.
Fix: update to 2.2.0 or later.

Package	Affected versions	Patched versions
markdown-it-py PyPI	`< 2.2.0`	`2.2.0`
markdown-it-py executablebooks	`< 2.2.0`	`2.2.0`

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.

NVD 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.

References

nvd.nist.gov/vuln/detail/CVE-2023-26302 · ADVISORY
executablebooks/markdown-it-py#247 · WEB
executablebooks/markdown-it-py commit 53ca3e9 · WEB
executablebooks/markdown-it-py · PACKAGE
executablebooks/markdown-it-py release v2.2.0 · WEB
pypa/advisory-database · WEB
GitHub Advisory GHSA-jrwr-5x3p-hvc3 · ADVISORY

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Package

Affected versions

Patched versions

markdown-it-py

PyPI

< 2.2.0

2.2.0

markdown-it-py

executablebooks

< 2.2.0

2.2.0

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.

NVD 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.