What’s Vulnerable › Vulnerabilities

CVE-2022-21670: Uncontrolled Resource Consumption in markdown-it

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-10 · updated 2026-06-17
• Weakness: CWE-400

Description

markdown-it is a Markdown parser. Prior to version 1.3.2, special patterns with length greater than 50 thousand characterss could slow down the parser significantly. Users should upgrade to version 12.3.2 to receive a patch. There are no known workarounds aside from upgrading.

Affected products

• markdown-it: through 12.3.1

References

• https://github.com/markdown-it/markdown-it/commit/ffc49ab46b5b751cd2be0aabb146f2ef84986101
• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6vfc-qv3f-vr6c
• https://github.com/markdown-it/markdown-it/commit/ffc49ab46b5b751cd2be0aabb146f2ef84986101
• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6vfc-qv3f-vr6c

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