PatchTheCVECVE-2020-7767: All versions of package express-validators are vulnerable to Regular Expression Denial of Service (ReDoS) when
CVE-2020-7767 is a medium-severity flaw (CVSS 5.3) affecting express-validators. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
All versions of package express-validators are vulnerable to Regular Expression Denial of Service (ReDoS) when validating specifically-crafted invalid urls.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.6% (top 24%) |
| CISA exploited list | No |
| Weakness | CWE-400 |
| Published | 2020-11-11 |
| 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-2020-7767?
express-validators: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2020-7767 being exploited?
CVE-2020-7767 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-2020-7767 affect?
CVE-2020-7767 affects express-validators. Severity is medium (CVSS 5.3). All versions of package express-validators are vulnerable to Regular Expression Denial of Service (ReDoS) when validating specifically-crafted invalid urls.
How urgent is CVE-2020-7767?
Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action