GHSA-2V37-7H3G-55P8

Vulnerability from github – Published: 2026-07-29 15:31 – Updated: 2026-08-07 20:50
VLAI
Summary
nanoid: custom generators can loop indefinitely when size is zero
Details

nanoid (Nano ID) before 5.1.6 contains an infinite loop in the customAlphabet and customRandom functions. When these functions are configured with a size of 0, the internal generation loop never satisfies its exit condition and spins indefinitely, hanging the calling thread. An application that passes an unvalidated, attacker-controlled size of 0 to these functions is exposed to a denial-of-service condition.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2 (High)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "nanoid"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.17"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "nanoid"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "5.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-67213"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-07T20:50:34Z",
    "nvd_published_at": "2026-07-29T14:16:34Z",
    "severity": "HIGH"
  },
  "details": "nanoid (Nano ID) before 5.1.6 contains an infinite loop in the customAlphabet and customRandom functions. When these functions are configured with a size of 0, the internal generation loop never satisfies its exit condition and spins indefinitely, hanging the calling thread. An application that passes an unvalidated, attacker-controlled size of 0 to these functions is exposed to a denial-of-service condition.",
  "id": "GHSA-2v37-7h3g-55p8",
  "modified": "2026-08-07T20:50:34Z",
  "published": "2026-07-29T15:31:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67213"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ai/nanoid/commit/cb3626d0f3342fdf179cd425fd9c4fbb92c7d0e7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ai/nanoid/commit/f9d13f150847d117877adee3460a46eceb0cf49b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ai/nanoid"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ai/nanoid/releases/tag/3.3.17"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ai/nanoid/releases/tag/5.1.6"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-zero-size-in-customalphabet-and-customrandom"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "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_V4"
    }
  ],
  "summary": "nanoid: custom generators can loop indefinitely when size is zero"
}



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