Regular Expression Denial of Service in markdown
All versions of markdown are vulnerable to Regular Expression Denial of Service (ReDoS). The markdown.toHTML() function has significantly degraded performance when parsing long strings containing underscores. This may lead to Denial of Service if the parser accepts user input.
Recommendation
No fix is currently available. Consider using an alternative package until a fix is made available.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | markdown | >= 0.0.0 | no fix |
References
- Weakness (CWE)
CWE-400- Platform
- npm
- Package
markdown- Disclosed
- 04.09.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-wx77-rp39-c6vg - CC BY 4.0
Vulnerability history: markdown
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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