{
"id": "GHSA-2v37-7h3g-55p8",
"aliases": [
"CVE-2026-67213"
],
"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.",
"summary": "nanoid: custom generators can loop indefinitely when size is zero",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.18"
}
]
}
],
"package": {
"name": "nanoid",
"ecosystem": "npm"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "5.1.6"
}
]
}
],
"package": {
"name": "nanoid",
"ecosystem": "npm"
}
}
],
"modified": "2026-08-13T15:43:00Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"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"
}
],
"published": "2026-07-29T15:31:12Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67213",
"type": "ADVISORY"
},
{
"url": "https://github.com/ai/nanoid/commit/cb3626d0f3342fdf179cd425fd9c4fbb92c7d0e7",
"type": "WEB"
},
{
"url": "https://github.com/ai/nanoid/commit/e10f8d40ce9d1ab47f66d65a16b48086432730d0",
"type": "WEB"
},
{
"url": "https://github.com/ai/nanoid/commit/f9d13f150847d117877adee3460a46eceb0cf49b",
"type": "WEB"
},
{
"url": "https://github.com/ai/nanoid",
"type": "PACKAGE"
},
{
"url": "https://github.com/ai/nanoid/releases/tag/3.3.17",
"type": "WEB"
},
{
"url": "https://github.com/ai/nanoid/releases/tag/3.3.18",
"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",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-835"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-07-29T14:16:34Z",
"github_reviewed_at": "2026-08-07T20:50:34Z"
}
}