{
"id": "GHSA-m99w-x7hq-7vfj",
"aliases": [
"CVE-2026-64641"
],
"details": "## Impact\n\nCrafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process.\n\n## Workarounds\n\nNo workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.",
"summary": "Next.js: Denial of Service in App Router using Server Actions",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "13.0.0"
},
{
"fixed": "15.5.21"
}
]
}
],
"package": {
"name": "next",
"ecosystem": "npm"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "16.0.0"
},
{
"fixed": "16.2.11"
}
]
}
],
"package": {
"name": "next",
"ecosystem": "npm"
}
}
],
"modified": "2026-07-22T22:59:01Z",
"severity": [
{
"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": "2026-07-22T22:59:01Z",
"references": [
{
"url": "https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj",
"type": "WEB"
},
{
"url": "https://github.com/vercel/next.js/pull/96013",
"type": "WEB"
},
{
"url": "https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12",
"type": "WEB"
},
{
"url": "https://github.com/vercel/next.js",
"type": "PACKAGE"
},
{
"url": "https://github.com/vercel/next.js/releases/tag/v15.5.21",
"type": "WEB"
},
{
"url": "https://github.com/vercel/next.js/releases/tag/v16.2.11",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-834"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-07-22T22:59:01Z"
}
}