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EUVD-2026-28792Published

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…

Exact source revision recorded 28 Oct 2026 05:10:56 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2026-28792

Published

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.

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: May 8, 2026, 3:24:12 PM

dateUpdated: May 8, 2026, 4:43:48 PM

Source published
May 8, 2026, 3:24:12 PM (timezone not stated)
Source modified
May 8, 2026, 4:43:48 PM (timezone not stated)
Observed here
28 Oct 2026 05:10:56 UTC
Source terms
ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

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Sources read 7 Nov 17:14 UTC · 275 of 275 readable · 274 fully read · documentation 469/469 current

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