Lodash up to 4.17.x _.unset/_.omit prototype pollution

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.00

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.

The vulnerability scanner Nessus provides a plugin with the ID 304822 (Linux Distros Unpatched Vulnerability : CVE-2026-2950), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.18.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (304822). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (openjs): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Prototype pollution
CWE: CWE-1321 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 304822
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-2950

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Lodash 4.18.0

Timelineinfo

02/21/2026 CVE reserved
04/01/2026 +38 days Advisory disclosed
04/01/2026 +0 days VulDB entry created
07/25/2026 +115 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-xxjr-mmjv-4gpg
Researcher: shpik-kr, maru1009, ott3r07, zolbooo, backuardo, jdalton
Status: Confirmed

CVE: CVE-2026-2950 (🔒)
GCVE (CVE): GCVE-0-2026-2950
GCVE (VulDB): GCVE-100-354491

Entryinfo

Created: 04/01/2026 03:51
Updated: 07/25/2026 23:32
Changes: 04/01/2026 03:51 (64), 04/04/2026 22:32 (2), 07/25/2026 23:32 (13)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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