Summaryinfo

A vulnerability marked as critical has been reported in Lodash up to 4.17.x. Impacted is the function _.unset/_.omit. The manipulation leads to prototype pollution. This vulnerability is documented as CVE-2026-2950. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Lodash up to 4.17.x. It has been rated as critical. This issue affects the function _.unset/_.omit. The manipulation with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is integrity, and availability. The summary by CVE is:

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.

The weakness was released by shpik-kr, maru1009, ott3r07, zolbooo, backuardo and jdalton as GHSA-xxjr-mmjv-4gpg. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-2950 since 02/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 4.18.0 eliminates this vulnerability.

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Productinfo

Name

• Lodash

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17

Website

• Product: https://github.com/lodash/lodash/

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