CVE-2026-64647Next.js is a React framework for building full-stack web applications.
Updated under an hour ago ()
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It affects vercel next.js. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-116
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
vercel next.js vercel:next.js | from 13.0.0 before 15.5.21; from 16.0.0 before 16.2.11 | NVD |
References
- https://github.com/vercel/next.js/commit/025bf4a5f7b47fb7758c4ebf1c931a61c451c082patch
- https://github.com/vercel/next.js/pull/96008issue-tracking, patch
- https://github.com/vercel/next.js/releases/tag/v15.5.21product, release-notes
- https://github.com/vercel/next.js/releases/tag/v16.2.11product, release-notes
- https://github.com/vercel/next.js/security/advisories/GHSA-4633-3j49-mh5qvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.