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CVE-2026-44575 is an authorization bypass vulnerability in Next.js App Router applications that rely on middleware or proxy-based access-control checks. Affected versions generate middleware matchers that cover canonical routes but fail to consistently match certain App Router transport-specific request variants used for React Server Components and segment prefetching. As a result, specially crafted alternate route forms, including .rsc and segment-prefetch variants, can resolve to the same protected page while bypassing the intended middleware authorization logic. The flaw has been attributed to incomplete middleware matcher regex generation in the Next.js routing and build analysis logic. When the alternate transport URL is requested, middleware execution can be skipped and the protected page is still rendered, returning the React Server Components payload for content that should have required authorization.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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