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CVE-2026-27979— Next.js: Unbounded postponed resume buffering can lead to DoS

Quick assessment

Affected
vercel next.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Next.js是Vercel开源的一个 React 框架。 Next.js 16.0.1至16.1.7之前版本存在安全漏洞，该漏洞源于包含next-resume: 1标头的请求在某些设置中会缓冲请求体而未一致强制执行maxPostponedStateSize，可能导致过度内存使用和拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.84% · P56

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-27979

Vulnerability Information
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Vulnerability Title
Next.js: Unbounded postponed resume buffering can lead to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
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 `next-resume: 1` header (corresponding with a PPR resume request) would buffer request bodies without consistently enforcing `maxPostponedStateSize` 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 `experimental.ppr` or `cacheComponents`), an attacker could send oversized `next-resume` 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 `next-resume` header, as this is never valid to be sent from an untrusted client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Next.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Next.js是Vercel开源的一个 React 框架。 Next.js 16.0.1至16.1.7之前版本存在安全漏洞，该漏洞源于包含next-resume: 1标头的请求在某些设置中会缓冲请求体而未一致强制执行maxPostponedStateSize，可能导致过度内存使用和拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 16.0.1, < 16.1.7 -

II. Public POCs for CVE-2026-27979

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III. Intelligence Information for CVE-2026-27979

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Patches & Fixes for CVE-2026-27979 (1)

Vendor Advisories for CVE-2026-27979 (1)

Vendor Pages for CVE-2026-27979 (1)

Same Patch Batch · vercel · 2026-03-18 · 3 CVEs total

CVE-2026-27980 Next.js: Unbounded next/image disk cache growth can exhaust storage
CVE-2026-29057 Next.js: HTTP request smuggling in rewrites

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-770

V. Comments for CVE-2026-27979

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