{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64649", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-20T17:11:30.895Z", "datePublished": "2026-07-27T19:27:58.865Z", "dateUpdated": "2026-07-27T19:27:58.865Z"}, "containers": {"cna": {"title": "Next.js: Server-Side Request Forgery in Server Actions on Custom Servers", "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "lang": "en", "description": "CWE-918: Server-Side Request Forgery (SSRF)", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.3, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x"}, {"name": "https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b", "tags": ["x_refsource_MISC"], "url": "https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b"}, {"name": "https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498", "tags": ["x_refsource_MISC"], "url": "https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498"}, {"name": "https://github.com/vercel/next.js/releases/tag/v15.5.21", "tags": ["x_refsource_MISC"], "url": "https://github.com/vercel/next.js/releases/tag/v15.5.21"}, {"name": "https://github.com/vercel/next.js/releases/tag/v16.2.11", "tags": ["x_refsource_MISC"], "url": "https://github.com/vercel/next.js/releases/tag/v16.2.11"}], "affected": [{"vendor": "vercel", "product": "next.js", "versions": [{"version": ">= 14.1.1, < 15.5.21", "status": "affected"}, {"version": ">= 16.0.0 < 16.2.11", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-27T19:27:58.865Z"}, "descriptions": [{"lang": "en", "value": "Next.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery). This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization. Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host. Managed hosting pins the host upstream and is not affected; next start and standalone output do the same from version 14.2 onward. This issue has been fixed in versions 15.5.21 and 16.2.11."}], "source": {"advisory": "GHSA-89xv-2m56-2m9x", "discovery": "UNKNOWN"}}}}

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