CVE-2026-44572 (GCVE-0-2026-44572)

Vulnerability from cvelistv5 – Published: 2026-05-13 15:57 – Updated: 2026-05-14 15:33
VLAI?
Title
Next.js: Middleware / Proxy redirects can be cache-poisoned
Summary
Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.
Severity ?
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data
Assigner
References
Impacted products
Vendor Product Version
vercel next.js Affected: >= 12.2.0, < 15.5.16
Affected: >= 16.0.0, < 16.2.5
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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