AIKIDO-2025-10509
markdown2 is vulnerable to Regular Expression Denial of Service (ReDoS)
23
Low Risk
This Affects:
markdown2TL;DR
Affected versions of this package use a regular expression with inefficient complexity in the HTML tokenizer, specifically within the _run_span_gamut function. This inefficiency can be exploited with specially crafted input to trigger excessive CPU usage, resulting in degraded performance or potential denial-of-service (DoS) conditions due to high computational overhead during parsing.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
markdown2 is vulnerable to Regular Expression Denial of Service (ReDoS) in versions 1.0.0 - 2.5.3.
How to fix this
Upgrade the markdown2 library to the patch version.
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