markdown-it: Quadratic complexity DoS in smartquotes rule via replaceAt string operations
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| markdown-it | markdown-it | affected |
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| Markdown-it | Markdown-it |
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| Source | ID | Title |
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Github GHSA |
GHSA-6v5v-wf23-fmfq | markdown-it: Quadratic complexity DoS in smartquotes rule via replaceAt string operations |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.379% probability within 30 days)
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| Metrics |
ssvc
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| First Time appeared |
Markdown-it
Markdown-it markdown-it |
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| Vendors & Products |
Markdown-it
Markdown-it markdown-it |
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| Description | markdown-it is a Markdown parser. Versions 14.1.1 and below contain a denial-of-service vulnerability when typographer: true is enabled, due to quadratic (O(n^2)) processing in the smartquotes rule. The issue stems from repeatedly modifying strings with replaceAt(), which performs O(n) slicing and concatenation per quote character. This can cause excessive CPU consumption when parsing quote-heavy, user-supplied markdown and may let attackers degrade or disrupt service availability. Although typographer is disabled by default, many production apps enable it for smart typography, making the issue relevant. This issue has been fixed in version 14.2.0. | |
| Title | markdown-it: Quadratic complexity DoS in smartquotes rule via replaceAt string operations | |
| Weaknesses | CWE-400 | |
| References |
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| Metrics |
cvssV3_1
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