Low [CVE-2026-64647] Information disclosure via server-side request caching
This low-severity Red Hat Linux advisory covers CVE-2026-64647 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a server-side fetch with a request body may return a cached response body from a different request to the same URL but different body.
Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped.
This is only an issue when receiving request bodies with a content type charset other than UTF-8. For example, the UTF-16 byte sequences for 삃삃 and 섄섄 in the request body would share the same cache.
This issue has been fixed in versions 15.5.21 and 16.2.11. A flaw was found in Next.js.
This vulnerability allows a remote attacker to potentially access confidential data. This can lead to the unauthorized disclosure of sensitive information.
This Low impact information disclosure flaw affects Next.js applications where server-side fetches handle request bodies with non-UTF-8 charsets. Under these specific conditions, cached responses containing confidential data could be inadvertently exposed to unauthorized requests.
Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-524.
- 12.0.0
- 15.5.20
- 16.0.0
- 16.2.10
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 15.5.21
- 16.2.11
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation
Upgrade to a fixed release: 15.5.21, 16.2.11. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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