Answer in brief
CVE-2020-28500 records a Medium severity (CVSS 5.3) vulnerability in Regular Expression Denial of Service (ReDoS). The current sources do not mark it as known exploited. The current feed maps n/a/Lodash (generic), lodash (npm), lodash-es (npm), lodash.trim (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps n/a/Lodash (generic), lodash (npm), lodash-es (npm), lodash.trim (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| n/a/Lodashgeneric | versions prior to 4.17.21 | Not reported |
| lodashnpm | >=4.0.0 <4.17.21 | 4.17.21 |
| lodash-esnpm | >=4.0.0 <4.17.21 | 4.17.21 |
| lodash.trimnpm | >=4.0.0 | Not reported |
| lodash.trimendnpm | >=4.0.0 | Not reported |
| lodash-railsrubygems | >=4.0.0 <4.17.21 | 4.17.21 |
Published upstream
Feb 15, 2021
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
Lodash versions prior to 4.17.21 are vulnerable to Regular Expression Denial of Service (ReDoS) via the toNumber, trim and trimEnd functions.
Quoted source text, attributed separately from HOL analysis.