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Vulnerability record · CVE-2026-2950 · published 31 March 2026

CVE-2026-2950: Lodash prototype pollution vulnerability

Lodash · Lodash

The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. The fix for CVE-2025-13465 only guards against string key members, so an attacker can bypass the check by passing array-wrapped path segments. This allows deletion of properties from built-in prototypes such as Object.prototype, Number.prototype, and String.prototype. The issue permits deletion of prototype properties but does not allow overwriting their original behavior. The issue is patched from 4.18.0 to 4.18.1 depending on the package: lodash, lodash-es, and lodash-amd in 4.18.1, and the standalone lodash.unset and lodash.omit packages in 4.18.0.

5.3 CVSS 3.1 Medium EPSS 0.34% · top 72.5% CWE-1321 · Prototype pollution
5.3CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
2References
13 Nov 2026Last modified by NVD

Description

The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. The fix for CVE-2025-13465 only guards against string key members, so an attacker can bypass the check by passing array-wrapped path segments. This allows deletion of properties from built-in prototypes such as Object.prototype, Number.prototype, and String.prototype. The issue permits deletion of prototype properties but does not allow overwriting their original behavior. The issue is patched from 4.18.0 to 4.18.1 depending on the package: lodash, lodash-es, and lodash-amd in 4.18.1, and the standalone lodash.unset and lodash.omit packages in 4.18.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cna.openjsf.org/security-advisories.html Vendor Advisory
https://github.com/lodash/lodash/security/advisories/GHSA-f23m-r3pf-42rh Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-4800Lodash code injection vulnerabilityThe fix for CVE-2021-23337 added validation for the variable option in _.template but did not apply the same validation to options.imports key names,…EPSS 2.8%9.1CVE-2019-10744Lodash prototype pollution vulnerabilityVersions of lodash lower than 4.17.12 are vulnerable to Prototype Pollution. The function defaultsDeep could be tricked into adding or modifying prop…EPSS 5.0%7.4CVE-2020-8203Lodash allocation without limits vulnerabilityPrototype pollution attack when using _.zipObjectDeep in lodash before 4.17.20.EPSS 5.2%7.2CVE-2021-23337Lodash code injection vulnerabilityLodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.EPSS 20%6.9CVE-2025-13465Lodash prototype pollution vulnerabilityThe _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. An attacker can pass crafted paths which cause Lodash to delete met…EPSS 1.8%6.5CVE-2019-1010266Lodash uncontrolled resource consumption vulnerabilitylodash prior to 4.17.11 is affected by: CWE-400: Uncontrolled Resource Consumption. The impact is: Denial of service. The component is: Date handler.…EPSS 3.0%6.5CVE-2018-3721Lodash prototype pollution vulnerabilitylodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via defaultsDeep, merge, and mergeWith fu…EPSS 2.3%5.6CVE-2018-16487Lodash uncontrolled resource consumption vulnerabilityA prototype pollution vulnerability was found in lodash <4.17.11 where the functions merge, mergeWith, and defaultsDeep can be tricked into adding or…EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2026-2950), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.