CVE-2021-23337

Lodash versions prior to 4.17.21 are vulnerable to Regular Expression Denial of Service (ReDoS) via the toNumber, trim and trimEnd functions.

Lodash versions before 4.18.0 do not properly validate key names in the options.imports option of _.template. An attacker can inject default-parameter expressions that execute arbitrary code during template compilation. Additionally, prototype pollution can lead to similar attacks.

Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions. The fix for CVE-2025-13465 only guarded against string key members, but an attacker can bypass it by using array-wrapped path segments. This allows deletion of properties from built-in prototypes like Object.prototype.

A vulnerability in Lodash versions 4.0.0 through 4.17.22 allows prototype pollution via the _.unset and _.omit functions. An attacker can pass crafted paths that cause Lodash to delete methods from global prototypes.