CVE-2026-2950 (GCVE-0-2026-2950)

Vulnerability from cvelistv5 – Published: 2026-03-31 19:18 – Updated: 2026-10-15 06:44
VLAI
Title
lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`
Summary
The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. 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. The issue is patched from 4.18.0 to 4.18.1 depending on the package: lodash, lodash-es, and lodash-amd in 4.18.1, and the standalone lodash.unset and lodash.omit packages in 4.18.0.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-01 13:43 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
openjs CNA under the redhat root
CNA scorecard C 65/100 over 108 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
lodash lodash Affected: 4.17.23 , < 4.18.1 (semver)
Unaffected: 4.18.1 (semver)
guessed Create a notification for this product.
lodash lodash-es Affected: 4.17.23 , < 4.18.1 (semver)
Unaffected: 4.18.1 (semver)
guessed Create a notification for this product.
lodash lodash-amd Affected: 4.17.23 , < 4.18.1 (semver)
Unaffected: 4.18.1 (semver)
guessed Create a notification for this product.
lodash lodash.unset Affected: 0 , < 4.18.0 (semver)
Unaffected: 4.18.0 (semver)
guessed Create a notification for this product.
lodash lodash.omit Affected: 0 , < 4.18.0 (semver)
Unaffected: 4.18.0 (semver)
guessed Create a notification for this product.
Credits
Haruna38 shpik-kr maru1009 ott3r07 zolbooo backuardo falsyvalues jonchurch jdalton UlisesGascon
Show details on NVD website
To clipboard 

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              "type": "finder",
              "value": "backuardo"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "falsyvalues"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "jonchurch"
            },
            {
              "lang": "en",
              "type": "analyst",
              "value": "jdalton"
            },
            {
              "lang": "en",
              "type": "remediation reviewer",
              "value": "UlisesGascon"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. 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. The issue is patched from 4.18.0 to 4.18.1 depending on the package: lodash, lodash-es, and lodash-amd in 4.18.1, and the standalone lodash.unset and lodash.omit packages in 4.18.0."
                }
              ],
              "value": "The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. 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. The issue is patched from 4.18.0 to 4.18.1 depending on the package: lodash, lodash-es, and lodash-amd in 4.18.1, and the standalone lodash.unset and lodash.omit packages in 4.18.0."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-1321",
                  "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-15T06:44:37.552Z",
            "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "shortName": "openjs"
          },
          "references": [
            {
              "url": "https://github.com/lodash/lodash/security/advisories/GHSA-f23m-r3pf-42rh"
            },
            {
              "url": "https://cna.openjsf.org/security-advisories.html"
            }
          ],
          "title": "lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`",
          "x_generator": {
            "engine": "cve-kit 1.0.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "assignerShortName": "openjs",
        "cveId": "CVE-2026-2950",
        "datePublished": "2026-03-31T19:18:35.796Z",
        "dateReserved": "2026-02-21T20:04:35.087Z",
        "dateUpdated": "2026-10-15T06:44:37.552Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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