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Fencer Vulns
high 7.5

CVE-2020-7754 json

Regular Expression Denial of Service (ReDoS)

published 2020-10-16 6 y ago modified 2026-07-08 4 mo ago also GHSA-pw54-mh39-w3hc , GHSA-xgh6-85xh-479p , EUVD-2021-1154

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm npm-user-validate 1.0.1
  • n/a npm-user-validate 1.0.1
  • rh-nodejs12-nodejs RHEL 3 SOFTWARE_COLLECTIONS 12.20.1-1.el7
  • rh-nodejs12-npm RHEL 3 SOFTWARE_COLLECTIONS 6.14.10-12.20.1.1.el7
  • rh-nodejs12-nodejs-nodemon RHEL 3 SOFTWARE_COLLECTIONS 2.0.3-1.el7
  • npm RHEL 8 1:6.14.10-1.14.15.4.2.module+el8.3.0+9635+ffdf8381
  • nodejs RHEL 8 1:14.15.4-2.module+el8.3.0+9635+ffdf8381
  • nodejs-nodemon RHEL 8 2.0.3-1.module+el8.3.0+6519+9f98ed83
  • nodejs-full-i18n RHEL 8 1:14.15.4-2.module+el8.3.0+9635+ffdf8381
  • nodejs-packaging RHEL 8 23-3.module+el8.3.0+6519+9f98ed83

red hat advisories RHSA-2021:0485RHSA-2021:0551RHSA-2021:0549RHSA-2021:0421RHSA-2021:0548RHSA-2021:0521

  • nodejs-nodemon AlmaLinux 8 2.0.3-1.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging AlmaLinux 8 23-3.module_el8.5.0+254+b4526b16
  • nodejs-packaging AlmaLinux 8 23-3.module_el8.4.0+2522+3bd42762
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2224+b07ac28e
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.3.0+2023+d2377ea3
  • nodejs-nodemon AlmaLinux 8 1.18.3-1.module_el8.3.0+2023+d2377ea3
  • nodejs-nodemon AlmaLinux 8 1.18.3-1.module_el8.3.0+2047+b07ac28e

almalinux advisories ALSA-2021:0551ALSA-2021:0549ALSA-2021:0548

  • nodejs-nodemon Rocky Linux 8 2.0.3-1.module+el8.6.0+982+9fdca2d4
  • nodejs-nodemon Rocky Linux 8 2.0.3-1.module+el8.3.0+100+234774f7
  • nodejs-nodemon Rocky Linux 8 2.0.3-1.module+el8.4.0+638+5344c6f7
  • nodejs-packaging Rocky Linux 8 23-3.module+el8.7.0+1071+4bdda2a8
  • nodejs-packaging Rocky Linux 8 23-3.module+el8.3.0+100+234774f7
  • nodejs-packaging Rocky Linux 8 23-3.module+el8.5.0+733+de4fee6c
  • nodejs-packaging Rocky Linux 8 17-3.module+el8.3.0+101+f84c7154
  • nodejs-nodemon Rocky Linux 8 1.18.3-1.module+el8.3.0+101+f84c7154

rocky linux advisories RLSA-2021:0551RLSA-2021:0549RLSA-2021:0548

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-7754 updated cvss 7.5

nodejs-npm-user-validate: improper input validation when validating user emails leads to ReDoS

  • Red Hat OpenShift Container Platform 3.11 kibana
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4 kibana
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 10.23.1-1.module+el8.3.0+9502+012d8a97, nodejs 12.20.1-1.module+el8.3.0+9503+19cb079c, nodejs 14.15.4-2.module+el8.3.0+9635+ffdf8381, nodejs-packaging 17-3.module+el8+2873+aa7dfd9a, nodejs-nodemon 1.18.3-1.module+el8+2632+6c5111ed, nodejs-packaging 17-3.module+el8.1.0+3369+37ae6a45, +9 more
    fixed: vendor fix RHSA-2021:0548
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nodejs10-nodejs 10.23.1-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs14-nodejs 14.15.4-2.el7, rh-nodejs10-npm 6.14.10-10.23.1.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs14-npm 6.14.10-14.15.4.2.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-nodejs10-nodejs 10.23.1-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs14-nodejs 14.15.4-2.el7, rh-nodejs10-npm 6.14.10-10.23.1.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs14-npm 6.14.10-14.15.4.2.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-nodejs10-nodejs 10.23.1-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs14-nodejs 14.15.4-2.el7, rh-nodejs10-npm 6.14.10-10.23.1.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs14-npm 6.14.10-14.15.4.2.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nodejs10-nodejs 10.23.1-2.el7, rh-nodejs12-nodejs 12.20.1-1.el7, rh-nodejs14-nodejs 14.15.4-2.el7, rh-nodejs10-npm 6.14.10-10.23.1.2.el7, rh-nodejs12-npm 6.14.10-12.20.1.1.el7, rh-nodejs14-npm 6.14.10-14.15.4.2.el7, +1 more
    fixed: vendor fix RHSA-2021:0521

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.26% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-NPMUSERVALIDATE-1019352 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1019353 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm npm-user-validate
<1.0.1
1.0.1

Affected products

  • n/a npm-user-validate

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.