PatchTheCVECVE-2021-43308: An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the markdown-link-extractor np
CVE-2021-43308 is a medium-severity flaw (CVSS 5.9) affecting markdown-link-extractor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 34%) |
| CISA exploited list | No |
| Weakness | CWE-1333 |
| Published | 2022-06-02 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-43308?
markdown-link-extractor: upgrade to 3.0.2. Exact commands for each OS are on this page.
Is CVE-2021-43308 being exploited?
CVE-2021-43308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-43308 affect?
CVE-2021-43308 affects markdown-link-extractor. Severity is medium (CVSS 5.9). 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
How urgent is CVE-2021-43308?
Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action