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CVE-2026-64648

MEDIUM
6.0
CVSS 4.0
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 only applies to fetch calls with a request that has a different init than the one passed to fetch. A safe request would be: fetch(new Request(init), init). An unsafe request would be: fetch(new Request(init), aDifferentInit). This issue has been fixed in versions 15.5.21 and 16.2.11.

Metadata

CVE ID
CVE-2026-64648
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-07-20 17:11 UTC
Published
2026-07-27 19:20 UTC
Last updated
2026-07-28 14:14 UTC
Primary CWE
CWE-524
CWE-524: Use of Cache Containing Sensitive Information
Vendor / Product
vercel / next.js
Sources
cve.org  ·  NVD

Severity & Metrics

6.0 MEDIUM CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
vercel next.js — >= 13.0.0, < 15.5.21, >= 16.0.0, < 16.2.11
Weakness (CWE)
CWESourceDescription
CWE-524 cna CWE-524: Use of Cache Containing Sensitive Information
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.0 MEDIUM 4.0 cna CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
References (5)
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