Answer in brief
CVE-2019-10744 records a Critical severity (CVSS 9.1) vulnerability in Prototype Pollution in lodash. The current sources do not mark it as known exploited. The current feed maps lodash (npm), lodash-amd (npm), lodash.defaultsdeep (npm), lodash-es (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 9.1. 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 lodash (npm), lodash-amd (npm), lodash.defaultsdeep (npm), lodash-es (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| lodashnpm | >=0 <4.17.12 | 4.17.12 |
| lodash-amdnpm | >=0 <4.17.13 | 4.17.13 |
| lodash.defaultsdeepnpm | >=0 <4.6.1 | 4.6.1 |
| lodash-esnpm | >=0 <4.17.14 | 4.17.14 |
| lodash-railsrubygems | >=0 <4.17.12 | 4.17.12 |
Published upstream
Jul 10, 2019
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
Versions of `lodash` before 4.17.12 are vulnerable to Prototype Pollution. The function `defaultsDeep` allows a malicious user to modify the prototype of `Object` via `{constructor: {prototype: {...}}}` causing the addition or modification of an existing property that will exist on all objects. ## Recommendation Update to version 4.17.12 or later.
Quoted source text, attributed separately from HOL analysis.