ruby-rails-assets-underscore — security advisory

{
  "id": "0d831bdcd179f00d7d0ed4cfa9117fe5b0e3f406cc9033dec36e97c571bcc927",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-27601",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-27601",
    "summary": "Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non-identical but equivalent datastructures that are then compared. Exceptions originating from the call to _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8.",
    "evidence": "osv:UBUNTU-CVE-2026-27601",
    "products": [
      {
        "name": {
          "value": "ruby-rails-assets-underscore",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.8.3+dfsg-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-rails-assets-underscore",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.8.3+dfsg-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-rails-assets-underscore",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.8.3+dfsg-4",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-rails-assets-underscore",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.8.3+dfsg-4",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1.8.3+dfsg-5",
            "evidence": "/affected/3/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-27601",
      "aliases": [
        "UBUNTU-CVE-2026-27601"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-rails-assets-underscore",
            "purl": "pkg:deb/ubuntu/ruby-rails-assets-underscore?arch=source&distro=bionic",
            "ecosystem": "Ubuntu:18.04:LTS"
          },
          "versions": [
            "1.8.3+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27601.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "ruby-rails-assets-underscore",
                "binary_version": "1.8.3+dfsg-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-rails-assets-underscore",
            "purl": "pkg:deb/ubuntu/ruby-rails-assets-underscore?arch=source&distro=focal",
            "ecosystem": "Ubuntu:20.04:LTS"
          },
          "versions": [
            "1.8.3+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27601.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "ruby-rails-assets-underscore",
                "binary_version": "1.8.3+dfsg-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-rails-assets-underscore",
            "purl": "pkg:deb/ubuntu/ruby-rails-assets-underscore?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "1.8.3+dfsg-4"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27601.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "ruby-rails-assets-underscore",
                "binary_version": "1.8.3+dfsg-4"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-rails-assets-underscore",
            "purl": "pkg:deb/ubuntu/ruby-rails-assets-underscore?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "1.8.3+dfsg-4",
            "1.8.3+dfsg-5"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27601.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "ruby-rails-assets-underscore",
                "binary_version": "1.8.3+dfsg-5"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-27T04:17:52.521558991Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-27601"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-27601",
        "https://www.cve.org/CVERecord?id=CVE-2026-27601",
        "https://github.com/jashkenas/underscore/commit/411e222eb0ca5d570cc4f6315c02c05b830ed2b4",
        "https://github.com/jashkenas/underscore/commit/a6e23ae9647461ec33ad9f92a2ecfc220eea0a84",
        "https://github.com/jashkenas/underscore/security/advisories/GHSA-qpx9-hpmf-5gmw"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-27601",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460319,
  "published_at": "2026-03-03T23:15:00+00:00"
}