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.
CVSS Score
8.1
EPSS Score
0.001
Published
2026-03-31
Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.
CVSS Score
7.2
EPSS Score
0.043
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
0.002
Published
2021-02-15
Prototype pollution attack when using _.zipObjectDeep in lodash before 4.17.20.
CVSS Score
7.4
EPSS Score
0.036
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
0.033
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
0.002
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
0.003
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
0.002
Published
2018-06-07