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UBUNTU-CVE-2026-4800 (CVE-2026-4800)

Vulnerability from osv_ubuntu – Published: 2026-03-31 20:16 – Updated: 2026-06-30 16:18 – Source website
VLAI
Details

Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in .template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, .template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function(). Patches: Users should upgrade to version 4.18.0. Workarounds: Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "2.4.1+dfsg-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "2.4.1+dfsg-3ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@2.4.1+dfsg-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.1+dfsg-3ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.1+dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "4.17.4+dfsg-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "4.17.4+dfsg-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@4.17.4+dfsg-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.4+dfsg-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.17.4+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "4.17.15+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "4.17.15+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash-packages",
            "binary_version": "4.17.15+dfsg-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@4.17.15+dfsg-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.15+dfsg-2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.17.11+dfsg-4",
        "4.17.15+dfsg-2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash-packages",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.17.21+dfsg+~cs8.31.173-1",
        "4.17.21+dfsg+~cs8.31.196.20210220-2",
        "4.17.21+dfsg+~cs8.31.198.20210220-4",
        "4.17.21+dfsg+~cs8.31.198.20210220-5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1"
          },
          {
            "binary_name": "node-lodash-packages",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.17.21+dfsg+~cs8.31.198.20210220-9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1"
          },
          {
            "binary_name": "node-lodash-packages",
            "binary_version": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.17.21+dfsg+~cs8.31.198.20210220-9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-lodash",
            "binary_version": "4.17.23+dfsg-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash",
            "binary_version": "4.17.23+dfsg-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-lodash-packages",
            "binary_version": "4.17.23+dfsg-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "node-lodash",
        "purl": "pkg:deb/ubuntu/node-lodash@4.17.23+dfsg-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.23+dfsg-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.17.21+dfsg+~cs8.31.198.20210220-9",
        "4.17.23+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function(). Patches: Users should upgrade to version 4.18.0. Workarounds: Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.",
  "id": "UBUNTU-CVE-2026-4800",
  "modified": "2026-06-30T16:18:36Z",
  "published": "2026-03-31T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-4800"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-4800"
    },
    {
      "type": "REPORT",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/advisories/GHSA-35jh-r3h4-6jhm"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8411-1"
    }
  ],
  "related": [
    "USN-8411-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-4800"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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