CVE-2026-4800
8.1 · HIGHOverview
CVE-2026-4800 is a high-severity vulnerability affecting lodash lodash. It was published on March 31, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from lodash. Update lodash to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| lodash | lodash | >= 4.0.0, < 4.18.0 | Affected |
| lodash | lodash-amd | >= 4.0.0, < 4.18.0 | Affected |
| lodash | lodash-es | >= 4.0.0, < 4.18.0 | Affected |
| lodash | lodash.template | >= 4.0.0, < 4.18.0 | Affected |
References
Frequently Asked Questions
What is CVE-2026-4800?
CVE-2026-4800 is a high-severity vulnerability affecting lodash lodash. It was published on March 31, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-4800?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-4800?
Check the references section for vendor advisories and patches from lodash. Update lodash to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-4800?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-4800 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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