{"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":"2026-07-28T14:12:06.654Z"},"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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T14:11:48.555168Z","id":"CVE-2026-64649","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-28T14:12:06.654Z"}}]}}