CVE-2026-4800
lodash vulnerable to Code Injection via `_.template` imports key names
Description
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.
INFO
Published Date :
March 31, 2026, 8:16 p.m.
Last Modified :
April 7, 2026, 3:43 p.m.
Remotely Exploit :
Yes !
Source :
ce714d77-add3-4f53-aff5-83d477b104bb
Affected Products
The following products are affected by CVE-2026-4800
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | ce714d77-add3-4f53-aff5-83d477b104bb | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Upgrade to version 4.18.0.
- Avoid untrusted input as options.imports key names.
Public PoC/Exploit Available at Github
CVE-2026-4800 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4800.
| URL | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Third Party Advisory |
| https://github.com/advisories/GHSA-35jh-r3h4-6jhm | Third Party Advisory |
| https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c | Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4800 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4800
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
CSS TypeScript JavaScript
None
JavaScript
Obsidian plugin
TypeScript JavaScript CSS TSQL
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4800 vulnerability anywhere in the article.
-
Daily CyberSecurity
Laravel Passport Patches Machine-to-Human Authentication Bypass
Laravel Passport is widely recognized as an OAuth2 server and API authentication package that is both simple and enjoyable for developers to implement. However, a newly disclosed security flaw has int ... Read more
-
Daily CyberSecurity
Joomla! Issues Security Patch: Critical File Deletion and Webservice Flaws Exposed
Joomla! CMS has released a series of critical security updates to address two high-severity vulnerabilities—CVE-2026-23898 and CVE-2026-23899—both carrying a CVSSv4 score of 8.6. These flaws strike at ... Read more
The following table lists the changes that have been made to the
CVE-2026-4800 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:lodash:lodash:*:*:*:*:*:node.js:*:* versions up to (excluding) 4.17.21 *cpe:2.3:a:lodash:lodash-es:*:*:*:*:*:node.js:*:* versions up to (excluding) 4.17.21 *cpe:2.3:a:lodash:lodash-rails:*:*:*:*:*:ruby:*:* versions up to (excluding) 4.17.21 *cpe:2.3:a:lodash:lodash.template:*:*:*:*:*:node.js:*:* versions up to (including) 4.5.0 Added Reference Type openjs: https://cna.openjsf.org/security-advisories.html Types: Third Party Advisory Added Reference Type openjs: https://github.com/advisories/GHSA-35jh-r3h4-6jhm Types: Third Party Advisory Added Reference Type openjs: https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c Types: Patch -
New CVE Received by ce714d77-add3-4f53-aff5-83d477b104bb
Mar. 31, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-94 Added Reference https://cna.openjsf.org/security-advisories.html Added Reference https://github.com/advisories/GHSA-35jh-r3h4-6jhm Added Reference https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c