{"answers":{"affected":"4 open source packages ship an affected version, including next. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-64641 in the wild and no public exploit code.","fix":"Upgrade next to a fixed version for your release line: 15.5.21 or 16.2.11.","what":"CVE-2026-64641 is a high-severity denial of service vulnerability in Vercel Next.js, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-64641 and fix it if it is affected.\n\nWhat it is: CVE-2026-64641 is a high-severity denial of service vulnerability in Vercel Next.js, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-64641 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- next (npm): affected from 13.0.0; fixed in 15.5.21\n- next (npm): affected from 13.0.0; fixed in 15.5.21\n- next (npm): affected from 16.0.0; fixed in 16.2.11\n- next (npm): affected from 16.0.0; fixed in 16.2.11\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-64641/ (Markdown: https://insights.sbomify.com/CVE-2026-64641/index.md)","id":"CVE-2026-64641","markdown":"https://insights.sbomify.com/CVE-2026-64641/index.md","name":"CVE-2026-64641","record":{"aliases":["CLEANSTART-2026-DU49201","CLEANSTART-2026-VZ23621","ECHO-c83f-f227-532a","GHSA-m99w-x7hq-7vfj","MINI-8x84-76c8-fh5m","MINI-f2fx-767w-ggqp","MINI-hj77-vpc8-jcqw","MINI-pjf5-594f-hm69","ROOT-APP-NPM-CVE-2026-64641"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Next.js framework","requires_auth":"none","summary":"Attackers can cause excessive CPU usage and block request processing in Next.js App Router applications using Server Actions via crafted requests.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"next.js","vendor":"vercel"}],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-834","name":"Excessive Iteration"}],"description":"Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted 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. This issue has been fixed in versions 15.5.21 and 16.2.11.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Next.js: Denial of Service in App Router using Server Actions","id":"CVE-2026-64641","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"vercel:next.js","products":["vercel:next.js"],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":5,"next":{"headline":"Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale","id":"CVE-2026-64642"},"packages":[{"ecosystem":"npm","fixed":["15.5.21"],"introduced":["13.0.0"],"last_affected":[],"package":"next","purl":null,"source":"GHSA-m99w-x7hq-7vfj"},{"ecosystem":"npm","fixed":["15.5.21"],"introduced":["13.0.0"],"last_affected":[],"package":"next","purl":"pkg:npm/next","source":"GHSA-m99w-x7hq-7vfj"},{"ecosystem":"npm","fixed":["16.2.11"],"introduced":["16.0.0"],"last_affected":[],"package":"next","purl":null,"source":"GHSA-m99w-x7hq-7vfj"},{"ecosystem":"npm","fixed":["16.2.11"],"introduced":["16.0.0"],"last_affected":[],"package":"next","purl":"pkg:npm/next","source":"GHSA-m99w-x7hq-7vfj"}],"prev":{"headline":"Apache Polaris: register endpoint reads attacker-controlled storage location before allowed-locations validation","id":"CVE-2026-64640"},"products":["next.js"],"published":"2026-07-27","related":[{"cvss_score":9.1,"headline":"Authorization Bypass in Next.js Middleware","id":"CVE-2025-29927","kev_date_added":null,"published":"2025-03-21"},{"cvss_score":8.6,"headline":"Next.js: Server-side request forgery in applications using WebSocket upgrades","id":"CVE-2026-44578","kev_date_added":null,"published":"2026-05-13"},{"cvss_score":8.3,"headline":"Next.js: Server-Side Request Forgery in Image Optimization","id":"CVE-2026-94483","kev_date_added":null,"published":"2026-10-02"},{"cvss_score":8.3,"headline":"Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale","id":"CVE-2026-64642","kev_date_added":null,"published":"2026-07-27"},{"cvss_score":8.3,"headline":"Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname","id":"CVE-2026-64645","kev_date_added":null,"published":"2026-07-27"},{"cvss_score":8.3,"headline":"Next.js: Server-Side Request Forgery in Server Actions on Custom Servers","id":"CVE-2026-64649","kev_date_added":null,"published":"2026-07-27"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-27","vendors":["vercel"]},"summary":"Attackers can cause excessive CPU usage and block request processing in Next.js App Router applications using Server Actions via crafted requests.","url":"https://insights.sbomify.com/CVE-2026-64641/"}