Exponential ReDoS in markdown-link-extractor
Priority LOW 35CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the markdown-link-extractor npm package, when an attacker is able to supply arbitrary input to the module's exported function
Why it matters now
EPSS 0.01097 65th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed markdown-link-extractor (markdown-link-extractor): 3.0.2markdown-link-extractor (npm): 3.0.2, 4.0.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| markdown-link-extractor | markdown-link-extractor | before 3.0.2 | 3.0.2 | Patch available | CNA |
| — | markdown-link-extractor (npm) | before 3.0.2 | 3.0.2 | Patch available | GHSA-mmh6-m7v9-5956 |
| — | markdown-link-extractor (npm) | 4.0.0 to before 4.0.1 | 4.0.1 | Patch available | GHSA-mmh6-m7v9-5956 |
- markdown-link-extractor Vendormarkdown-link-extractor Affected before 3.0.2 Fixed in 3.0.2 Patch available CNA
- markdown-link-extractor (npm) Vendor— Affected before 3.0.2 Fixed in 3.0.2 Patch available GHSA-mmh6-m7v9-5956
- markdown-link-extractor (npm) Vendor— Affected 4.0.0 to before 4.0.1 Fixed in 4.0.1 Patch available GHSA-mmh6-m7v9-5956
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:markdown-link-extractor_project:markdown-link-extractor:*:*:*:*:*:node.js:*:* | before 3.0.2 | Vulnerable | Markdown-link-extractor Project |
| cpe:2.3:a:markdown-link-extractor_project:markdown-link-extractor:4.0.0:*:*:*:*:node.js:*:* | 4.0.0 | Vulnerable | Markdown-link-extractor Project |
- cpe:2.3:a:markdown-link-extractor_project:markdown-link-extractor:*:*:*:*:*:node.js:*:* Versions before 3.0.2 Vulnerable ·Markdown-link-extractor Project
- cpe:2.3:a:markdown-link-extractor_project:markdown-link-extractor:4.0.0:*:*:*:*:node.js:*:* Versions 4.0.0 Vulnerable ·Markdown-link-extractor Project
Remediation
- Fix · CNA markdown-link-extractor (markdown-link-extractor) Fixed in 3.0.2
- Fix · GHSA-mmh6-m7v9-5956 markdown-link-extractor (npm) Fixed in 3.0.2 Advisory →
- Fix · GHSA-mmh6-m7v9-5956 markdown-link-extractor (npm) Fixed in 4.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-43308
- 2026-10-03 Alias added: GHSA-mmh6-m7v9-5956
References
Sources
- CVE-2021-43308 · CVE Program
- CVE-2021-43308 · NVD
- FIRST EPSS
- GHSA-mmh6-m7v9-5956 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences