CVE-2020-7754 Regular Expression Denial of Service (ReDoS)
An attacker can cause a denial of service by providing long email inputs starting with @, triggering exponential regex processing in the npm-user-validate library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-7754?
CVE-2020-7754 is a high-severity denial of service vulnerability in npm-user-validate, published on 27 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
This affects the package npm-user-validate before 1.0.1. The regex that validates user emails took exponentially longer to process long input strings beginning with @ characters.
Which versions are affected by CVE-2020-7754?
4 open source packages ship an affected version, including npm-user-validate. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
npm-user-validate npm | All versions | 1.0.1 |
npm-user-validate npm | All versions | 1.0.1 |
npm-user-validate npm | All versions | 1.0.1 |
npm-user-validate npm | All versions | 1.0.1 |
Products include Npmjs Npm-User-Validate.
How do I fix CVE-2020-7754?
Upgrade npm-user-validate to 1.0.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-7754 being exploited?
There is no known exploitation of CVE-2020-7754 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1772583197, CLSA-2026-1784682764, GHSA-pw54-mh39-w3hc, GHSA-xgh6-85xh-479p, ROOT-APP-NPM-CVE-2020-7754.