{
  "cveId": "CVE-2026-27601",
  "url": "https://patchblox.com/security/cve/CVE-2026-27601",
  "summary": "CVE-2026-27601 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-27601, released March 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Underscore.js has unlimited recursion in _.flatten and _.isEqual, potential for DoS attack",
  "description": "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.",
  "published": "2026-03-03T23:15:55Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Allocation of Resources Without Limits or Throttling",
  "epss": 0.01063,
  "epssPercentile": 0.64822,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27601",
  "fixes": [
    {
      "platform": "linux",
      "product": "agama-web-ui",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "17\u002B673.b97ba64d6-160000.12.1",
      "fix": "OPENSUSE-SU-2026:21448-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21448-1",
      "released": "2026-07-27T15:55:38Z"
    },
    {
      "platform": "linux",
      "product": "underscore",
      "release": "Debian 14",
      "fixedVersion": "1.13.8~dfsg\u002B~1.13.0-1",
      "fix": "DEBIAN-CVE-2026-27601",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27601",
      "released": "2026-03-03T23:15:55Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}