{"answers":{"affected":"2 open source packages ship an affected version, including react-router. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42211 in the wild and no public exploit code.","fix":"Upgrade react-router to 7.14.2 or later.","what":"CVE-2026-42211 is a high-severity unsafe deserialization vulnerability in remix-run react-router, published on 2 Jun 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-2026-42211 and fix it if it is affected.\n\nWhat it is: CVE-2026-42211 is a high-severity unsafe deserialization vulnerability in remix-run react-router, published on 2 Jun 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-2026-42211 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- react-router (npm): affected from 7.0.0; fixed in 7.14.2\n- react-router (npm): affected from 7.0.0; fixed in 7.14.2\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-2026-42211/ (Markdown: https://insights.sbomify.com/CVE-2026-42211/index.md)","id":"CVE-2026-42211","markdown":"https://insights.sbomify.com/CVE-2026-42211/index.md","name":"CVE-2026-42211","record":{"aliases":["CLSA-2026-1784856365","CLSA-2026-1792192812","CLSA-2026-1792253397","CLSA-2026-1792253409","CLSA-2026-1792419112","CLSA-2026-1792419189","CLSA-2026-1792419268","CLSA-2026-1792419624","CLSA-2026-1792421942","CLSA-2026-1792424731","CLSA-2026-1792425406","CLSA-2026-1792428106","CLSA-2026-1792430031","GHSA-49rj-9fvp-4h2h","ROOT-APP-NPM-CVE-2026-42211"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"React Router library","requires_auth":"none","summary":"Attackers can achieve remote code execution in React Router Framework Mode via unsafe deserialization if prototype pollution exists.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"react-router","vendor":"shopify"}],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (`\u003cBrowserRouter\u003e`) or Data Mode (`createBrowserRouter/\u003cRouterProvider\u003e`). This is patched in version 7.14.2.","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":"React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE","id":"CVE-2026-42211","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"SolidCAM-GPPL-IDE: XML External Entity (XXE) and billion-laughs DoS in VMID parser","id":"CVE-2026-42212"},"packages":[{"ecosystem":"npm","fixed":["7.14.2"],"introduced":["7.0.0"],"last_affected":[],"package":"react-router","purl":null,"source":"GHSA-49rj-9fvp-4h2h"},{"ecosystem":"npm","fixed":["7.14.2"],"introduced":["7.0.0"],"last_affected":[],"package":"react-router","purl":"pkg:npm/react-router","source":"GHSA-49rj-9fvp-4h2h"}],"prev":{"headline":"Webmin 2FA requirement bypass","id":"CVE-2026-42210"},"products":["react-router"],"published":"2026-06-02","related":[{"cvss_score":8.7,"headline":"React Router: Unauthenticated Denial of Service via Inefficient Route Matching","id":"CVE-2026-55685","kev_date_added":null,"published":"2026-07-27"},{"cvss_score":8.2,"headline":"React Router SSR XSS in ScrollRestoration","id":"CVE-2026-21884","kev_date_added":null,"published":"2026-01-10"},{"cvss_score":8,"headline":"React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets","id":"CVE-2026-33245","kev_date_added":null,"published":"2026-06-02"},{"cvss_score":8,"headline":"React Router vulnerable to XSS via Open Redirects","id":"CVE-2026-22029","kev_date_added":null,"published":"2026-01-10"},{"cvss_score":7.6,"headline":"React Router has XSS Vulnerability","id":"CVE-2025-59057","kev_date_added":null,"published":"2026-01-10"},{"cvss_score":7.5,"headline":"React Router vulnerable to Denial of Service via reflected user input in single-fetch","id":"CVE-2026-34077","kev_date_added":null,"published":"2026-06-02"}],"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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-06-03","vendors":["remix-run"]},"summary":"Attackers can achieve remote code execution in React Router Framework Mode via unsafe deserialization if prototype pollution exists.","url":"https://insights.sbomify.com/CVE-2026-42211/"}