{"id":"CVE-2026-41690","revision":"7b73b93ff27a462c9ce0551bab5d62d2","records":[{"revision":"7b73b93ff27a462c9ce0551bab5d62d2","observedAt":"2026-10-25T09:17:41.905+00:00","statement":{"source":"nvd","id":"CVE-2026-41690","aliases":[],"title":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting…","description":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on downstream code  it can be chained into RCE.","state":0,"publishedAt":"2026-05-08T16:16:11.473+00:00","modifiedAt":"2026-06-17T10:47:00.617+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":8.6,"severity":"HIGH"}],"references":["https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41690","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-22","CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-05-08T16:16:11.473","lastModified":"2026-06-17T10:47:00.617"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-41690","identifiers":["CVE-2026-41690"]},"retained":false,"historicalAffected":[]}],"coverage":[]}