Answer in brief
CVE-2021-23337 records a High severity (CVSS 8.1) vulnerability in lodash vulnerable to Code Injection via `_.template` imports key names. The current sources do not mark it as known exploited. The current feed maps lodash/lodash (generic), lodash/lodash-amd (generic), lodash/lodash-es (generic), lodash/lodash.template (generic) 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.
Answer in brief
CVE-2021-23337 records a High severity (CVSS 8.1) vulnerability in lodash vulnerable to Code Injection via `_.template` imports key names. The current sources do not mark it as known exploited. The current feed maps lodash/lodash (generic), lodash/lodash-amd (generic), lodash/lodash-es (generic), lodash/lodash.template (generic) 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 8.1. 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/lodash (generic), lodash/lodash-amd (generic), lodash/lodash-es (generic), lodash/lodash.template (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:lodash:lodash-amd:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:lodash:lodash-es:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:lodash:lodash:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:lodash:lodash.template:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| lodash/lodashgeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash/lodash-amdgeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash/lodash-esgeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash/lodash.templategeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodashnpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodashnpm | >=0 <4.17.21 | 4.17.21 |
| lodash-amdnpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash-esnpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash-esnpm | >=0 <4.17.21 | 4.17.21 |
| lodash-templatenpm | >=0 | Not reported |
| lodash.templatenpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash.templatenpm | >=0 | Not reported |
| lodash-railsrubygems | >=0 <4.17.21 | 4.17.21 |
Published upstream
Mar 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function(). Patches: Users should upgrade to version 4.18.0. Workarounds: Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.
Quoted source text, attributed separately from HOL analysis.
CVSS is 8.1. 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/lodash (generic), lodash/lodash-amd (generic), lodash/lodash-es (generic), lodash/lodash.template (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:lodash:lodash-amd:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:lodash:lodash-es:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:lodash:lodash:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| cpe:2.3:a:lodash:lodash.template:*:*:*:*:*:node.js:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| lodash/lodashgeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash/lodash-amdgeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash/lodash-esgeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash/lodash.templategeneric | >=4.0.0 <4.18.0 | 4.18.0 |
| lodashnpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodashnpm | >=0 <4.17.21 | 4.17.21 |
| lodash-amdnpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash-esnpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash-esnpm | >=0 <4.17.21 | 4.17.21 |
| lodash-templatenpm | >=0 | Not reported |
| lodash.templatenpm | >=4.0.0 <4.18.0 | 4.18.0 |
| lodash.templatenpm | >=0 | Not reported |
| lodash-railsrubygems | >=0 <4.17.21 | 4.17.21 |
Published upstream
Mar 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function(). Patches: Users should upgrade to version 4.18.0. Workarounds: Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.
Quoted source text, attributed separately from HOL analysis.