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CVE-2026-2950— lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`

Quick assessment

Affected
lodash lodash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

lodash是Lodash Utilities开源的一个JavaScript实用程序库。 lodash 4.17.23及之前版本存在安全漏洞，该漏洞源于_.unset和_.omit函数存在原型污染，可能导致删除内置原型的属性。

CVSS 6.5 · Medium EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-2950

Vulnerability Information
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Vulnerability Title
lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
lodash 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lodash是Lodash Utilities开源的一个JavaScript实用程序库。 lodash 4.17.23及之前版本存在安全漏洞，该漏洞源于_.unset和_.omit函数存在原型污染，可能导致删除内置原型的属性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lodash lodash 4.17.23 ~ 4.18.0 -
lodash lodash-es 4.17.23 ~ 4.18.0 -
lodash lodash-amd 4.17.23 ~ 4.18.0 -
lodash lodash.unset 4.0.0 ~ 4.18.0 -

II. Public POCs for CVE-2026-2950

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III. Intelligence Information for CVE-2026-2950

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IV. Related Vulnerabilities

Same product: lodash
Same vendor: lodash
Same weakness: CWE-1321

V. Comments for CVE-2026-2950

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