Impact:
Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions. The fix for (CVE-2025-13465: https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) 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.
Patches:
This issue is patched in 4.18.0.
Workarounds:
None. Upgrade to the patched version.
CVSS Score
6.5
EPSS Score
0.003
Published
2026-03-31
Lodash versions 4.0.0 through 4.17.22 are vulnerable to prototype pollution in the _.unset and _.omit functions. An attacker can pass crafted paths which cause Lodash to delete methods from global prototypes.
The issue permits deletion of properties but does not allow overwriting their original behavior.
This issue is patched on 4.17.23
CVSS Score
6.9
EPSS Score
0.016
Published
2026-01-21
Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.
CVSS Score
7.2
EPSS Score
0.213
Published
2021-02-15
Lodash versions prior to 4.17.21 are vulnerable to Regular Expression Denial of Service (ReDoS) via the toNumber, trim and trimEnd functions.
CVSS Score
5.3
EPSS Score
0.073
Published
2021-02-15
Prototype pollution attack when using _.zipObjectDeep in lodash before 4.17.20.
CVSS Score
7.4
EPSS Score
0.052
Published
2020-07-15
Versions of lodash lower than 4.17.12 are vulnerable to Prototype Pollution. The function defaultsDeep could be tricked into adding or modifying properties of Object.prototype using a constructor payload.
CVSS Score
9.1
EPSS Score
0.05
Published
2019-07-26
lodash prior to 4.17.11 is affected by: CWE-400: Uncontrolled Resource Consumption. The impact is: Denial of service. The component is: Date handler. The attack vector is: Attacker provides very long strings, which the library attempts to match using a regular expression. The fixed version is: 4.17.11.
CVSS Score
6.5
EPSS Score
0.031
Published
2019-07-17
A prototype pollution vulnerability was found in lodash <4.17.11 where the functions merge, mergeWith, and defaultsDeep can be tricked into adding or modifying properties of Object.prototype.
CVSS Score
5.6
EPSS Score
0.016
Published
2019-02-01
lodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via defaultsDeep, merge, and mergeWith functions, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.
CVSS Score
6.5
EPSS Score
0.024
Published
2018-06-07