CVE-2026-27979
Next.js is a React framework for building full-stack web applications.
Published Mar 18, 2026 · updated Jun 17, 2026 · vercel next.js
Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, a request containing the header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing in certain setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments remained vulnerable to the same unbounded postponed resume-body buffering behavior. In applications using the App Router with Partial Prerendering capability enabled (via or ), an attacker could send oversized POST payloads that were buffered without consistent size enforcement in non-minimal deployments, causing excessive memory usage and potential denial of service. This is fixed in version 16.1.7 by enforcing size limits across all postponed-body buffering paths and erroring when limits are exceeded. If upgrading is not immediately possible, block requests containing the header, as this is never valid to be sent from an untrusted client.
Code
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Timeline
Detection, updates, and resolution for this record.
Mar 18, 2026 · NIST NVD
Detected
Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, a request containing the header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing in certain setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments remained vulnerable to
Jun 17, 2026 · NIST NVD
Updated
Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, a request containing the header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing in certain setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments remained vulnerable to
Affected
- cpe vercel/next.jsversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-27979
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-27979
Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, a request containing the header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing `ma
nvd.nist.gov