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Duplicate Advisory: Regular Expression Denial of Service in simple-markdown

Moderate severity GitHub Reviewed Published Sep 3, 2020 to the GitHub Advisory Database • Updated Feb 3, 2026
Withdrawn This advisory was withdrawn on Feb 3, 2026

Package

npm simple-markdown (npm)

Affected versions

< 0.5.2

Patched versions

0.5.2

Description

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-gpvj-gp8c-c7p2. This link is maintained to preserve external references.

Original Description

Versions of simple-markdown prior to 0.5.2 are vulnerable to Regular Expression Denial of Service (ReDoS). The SimpleMarkdown.defaultInlineParse() function has significantly degraded performance when parsing inline code blocks.

Recommendation

Upgrade to version 0.5.2 or later.

References

Reviewed Aug 31, 2020
Published to the GitHub Advisory Database Sep 3, 2020
Withdrawn Feb 3, 2026
Last updated Feb 3, 2026

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

Weaknesses

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-4xf9-pgvv-xx67

Source code

Credits

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