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Uncontrolled Resource Consumption in markdown-it

Moderate severity GitHub Reviewed Published Jan 8, 2022 in markdown-it/markdown-it • Updated Jul 24, 2023

Package

npm markdown-it (npm)

Affected versions

< 12.3.2

Patched versions

12.3.2

Description

Impact

Special patterns with length > 50K chars can slow down parser significantly.

const md = require('markdown-it')();

md.render(`x ${' '.repeat(150000)} x  \nx`);

Patches

Upgrade to v12.3.2+

Workarounds

No.

References

Fix + test sample: markdown-it/markdown-it@ffc49ab

References

@puzrin puzrin published to markdown-it/markdown-it Jan 8, 2022
Published by the National Vulnerability Database Jan 10, 2022
Reviewed Jan 10, 2022
Published to the GitHub Advisory Database Jan 12, 2022
Last updated Jul 24, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS score

0.102%
(43rd percentile)

Weaknesses

CVE ID

CVE-2022-21670

GHSA ID

GHSA-6vfc-qv3f-vr6c

Source code

Credits

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