{"answers":{"affected":"4 open source packages ship an affected version, including next. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-64643 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-2026-64643 is a medium-severity 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-2026-64643 and fix it if it is affected.\n\nWhat it is: CVE-2026-64643 is a medium-severity 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-2026-64643 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-2026-64643/ (Markdown: https://insights.sbomify.com/CVE-2026-64643/index.md)","id":"CVE-2026-64643","markdown":"https://insights.sbomify.com/CVE-2026-64643/index.md","name":"CVE-2026-64643","record":{"aliases":["CLEANSTART-2026-BM18336","CLEANSTART-2026-LF50543","ECHO-9c66-41a7-0eec","GHSA-955p-x3mx-jcvp","MINI-2fx4-j5jv-6p5h","MINI-4cg3-rc6f-xg6p","MINI-mm9v-633h-h5p5","MINI-rg9x-rv52-q5p8","ROOT-APP-NPM-CVE-2026-64643"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Next.js framework","requires_auth":"none","summary":"Unauthenticated attackers can disclose internal Server Action endpoints in Next.js App Router applications, bypassing page-level authentication controls.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"next.js","vendor":"vercel"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-201","name":"Insertion of Sensitive Information Into Sent Data"}],"description":"Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. 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: Unauthenticated Disclosure of Internal Server Function endpoints","id":"CVE-2026-64643","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"vercel:next.js","products":["vercel:next.js"],"type":"information_disclosure","year":"2026"},"n_packages":4,"n_references":5,"next":{"headline":"Next.js: Denial of Service in the Image Optimization API using SVGs","id":"CVE-2026-64644"},"packages":[{"ecosystem":"npm","fixed":["15.5.21"],"introduced":["13.0.0"],"last_affected":[],"package":"next","purl":null,"source":"GHSA-955p-x3mx-jcvp"},{"ecosystem":"npm","fixed":["15.5.21"],"introduced":["13.0.0"],"last_affected":[],"package":"next","purl":"pkg:npm/next","source":"GHSA-955p-x3mx-jcvp"},{"ecosystem":"npm","fixed":["16.2.11"],"introduced":["16.0.0"],"last_affected":[],"package":"next","purl":null,"source":"GHSA-955p-x3mx-jcvp"},{"ecosystem":"npm","fixed":["16.2.11"],"introduced":["16.0.0"],"last_affected":[],"package":"next","purl":"pkg:npm/next","source":"GHSA-955p-x3mx-jcvp"}],"prev":{"headline":"Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale","id":"CVE-2026-64642"},"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"},{"cvss_score":8.2,"headline":"Next.js: Denial of Service in App Router using Server Actions","id":"CVE-2026-64641","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":"Unauthenticated attackers can disclose internal Server Action endpoints in Next.js App Router applications, bypassing page-level authentication controls.","url":"https://insights.sbomify.com/CVE-2026-64643/"}