CVE-2026-27979Network attack vector

Denial of service via unbounded resume-body buffering

Published Mar 18, 2026 · Updated Mar 18, 2026

Denial of service in Vercel Next.js 16.0.1 through 16.1.6 allows remote attackers to exhaust server memory via oversized PPR resume requests. The non-minimal App Router path collects and concatenates every chunk of a next-resume POST body without applying maxPostponedStateSize. The request is unauthenticated, but App Router with experimental.ppr or cacheComponents must be enabled; memory exhaustion can interrupt the Node.js service.

CVSS severity6.9
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Vercel Next.js 16.0.1 through 16.1.6 allows remote attackers to exhaust server memory via oversized PPR resume requests. The non-minimal App Router path collects and concatenates every chunk of a next-resume POST body without applying maxPostponedStateSize. The request is unauthenticated, but App Router with experimental.ppr or cacheComponents must be enabled; memory exhaustion can interrupt the Node.js service.

The record

CVE
CVE-2026-27979
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
Vercel
Product
Next.js
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 16.0.1, < 16.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · Next.jsversion=>= 16.0.1, < 16.1.7

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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