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Vulnerabilities CVE-2026-64647

CVE-2026-64647

Medium
Open
TLP:CLEAR

Next.js: Response Body Cache Confusion with Invalid UTF-8 Request Bodies

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Description

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.

Details

CVSS Score
6.3
EPSS Score
0.34%

26.6th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Jul 27, 2026
Last Modified
Jul 27, 2026
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