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.
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Fri, 08 May 2026 17:30:00 +0000
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Fri, 08 May 2026 16:00:00 +0000
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| 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. | |
| Title | Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters | |
| Weaknesses | CWE-1321 CWE-22 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-05-08T16:43:48.281Z
Reserved: 2026-04-22T03:53:24.407Z
Link: CVE-2026-41690
Updated: 2026-05-08T16:42:42.875Z
Status : Received
Published: 2026-05-08T16:16:11.473
Modified: 2026-05-08T16:16:11.473
Link: CVE-2026-41690
No data.
OpenCVE Enrichment
Updated: 2026-05-08T18:00:16Z