GHSA-F23M-R3PF-42RH

Vulnerability from github – Published: 2026-04-01 23:50 – Updated: 2026-04-01 23:50
VLAI?
Summary
lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`
Details

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 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.

Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.23"
      },
      "package": {
        "ecosystem": "npm",
        "name": "lodash"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.23"
      },
      "package": {
        "ecosystem": "npm",
        "name": "lodash-es"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.23"
      },
      "package": {
        "ecosystem": "npm",
        "name": "lodash-amd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "lodash.unset"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2950"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T23:50:27Z",
    "nvd_published_at": "2026-03-31T20:16:26Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nLodash 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`.\n\nThe issue permits deletion of prototype properties but does not allow overwriting their original behavior.\n\n### Patches\n\nThis issue is patched in 4.18.0.\n\n### Workarounds\n\nNone. Upgrade to the patched version.",
  "id": "GHSA-f23m-r3pf-42rh",
  "modified": "2026-04-01T23:50:27Z",
  "published": "2026-04-01T23:50:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lodash/lodash/security/advisories/GHSA-f23m-r3pf-42rh"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2950"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lodash/lodash"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`"
}


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