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5 vulnerabilities found for markdown-it by markdown-it
CVE-2026-48988 (GCVE-0-2026-48988)
Vulnerability from cvelistv5 – Published: 2026-06-17 20:54 – Updated: 2026-06-18 19:41
VLAI
Title
markdown-it: Quadratic complexity DoS in smartquotes rule via replaceAt string operations
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/markdown-it/markdown-it/securi… | x_refsource_CONFIRM |
| https://github.com/markdown-it/markdown-it/commit… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | markdown-it |
Affected:
< 14.2.0
|
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CVE-2025-7969 (GCVE-0-2025-7969)
Vulnerability from cvelistv5 – Published: 2025-08-21 16:40 – Updated: 2025-12-03 21:06 Disputed
VLAI
Title
Markdown-it 14.1.0 - Cross-site scripting (XSS)
Summary
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in markdown-it allows Cross-Site Scripting (XSS). This vulnerability is associated with program files lib/renderer.mjs.
This issue affects markdown-it: 14.1.0. NOTE: the Supplier does not consider this issue to be a vulnerability.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://fluidattacks.com/advisories/fito | third-party-advisory |
| https://github.com/markdown-it/markdown-it | product |
| https://github.com/markdown-it/markdown-it/issues/1122 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | markdown-it |
Affected:
14.1.0
(custom)
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CVE-2022-21670 (GCVE-0-2022-21670)
Vulnerability from cvelistv5 – Published: 2022-01-10 20:40 – Updated: 2025-04-22 18:33
VLAI
Title
Uncontrolled Resource Consumption in markdown-it
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/markdown-it/markdown-it/securi… | x_refsource_CONFIRM |
| https://github.com/markdown-it/markdown-it/commit… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | markdown-it |
Affected:
< 12.3.2
|
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CVE-2025-7969 (GCVE-0-2025-7969)
Vulnerability from nvd – Published: 2025-08-21 16:40 – Updated: 2025-12-03 21:06 Disputed
VLAI
Title
Markdown-it 14.1.0 - Cross-site scripting (XSS)
Summary
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in markdown-it allows Cross-Site Scripting (XSS). This vulnerability is associated with program files lib/renderer.mjs.
This issue affects markdown-it: 14.1.0. NOTE: the Supplier does not consider this issue to be a vulnerability.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://fluidattacks.com/advisories/fito | third-party-advisory |
| https://github.com/markdown-it/markdown-it | product |
| https://github.com/markdown-it/markdown-it/issues/1122 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | markdown-it |
Affected:
14.1.0
(custom)
|
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CVE-2022-21670 (GCVE-0-2022-21670)
Vulnerability from nvd – Published: 2022-01-10 20:40 – Updated: 2025-04-22 18:33
VLAI
Title
Uncontrolled Resource Consumption in markdown-it
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/markdown-it/markdown-it/securi… | x_refsource_CONFIRM |
| https://github.com/markdown-it/markdown-it/commit… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | markdown-it |
Affected:
< 12.3.2
|
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