Red Hat CVE-2026-27979
HIGH
GHSA-h27x-g6w4-24gq
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessEnable PPR in Next.js application
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DeliverySend POST request with next-resume header
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ExploitBypass maxPostponedStateSize enforcement
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ExecutionExhaust server memory
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ImpactTrigger denial of service
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource allocation limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Next.js application with Partial Prerendering (PPR) enabled via experimental.ppr or cacheComponents configuration in non-minimal mode deployments. Remote unauthenticated attacker can send crafted POST requests with next-resume header without size validation. |
| Impact | Service disruption affecting availability. In critical infrastructure, DoS can have cascading effects on dependent systems. |
| Exploit ScenarioDerived | An attacker sends specially crafted requests that cause excessive resource consumption (CPU, memory, disk) or trigger a crash in the target application. |
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Alert meAnalysisAIv1 – Mar 17, 2026
Unbounded request body buffering in Next.js App Router with Partial Prerendering enabled allows remote attackers to trigger denial of service through oversized next-resume POST requests that bypass size enforcement in non-minimal deployments. An attacker can exhaust server memory by sending specially crafted resume payloads without authentication or user interaction. The vulnerability affects applications with experimental PPR features enabled and has been patched with consistent size limit enforcement.
Earlier versions of this analysis (1)
RemediationAI
A vendor patch is available — apply it immediately. Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in npm
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users. This vulnerability is classified as Allocation of Resources Without Limits or Throttling (CWE-770).
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
Summary
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.
Impact
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.
Patches
Fixed by enforcing size limits across all postponed-body buffering paths and erroring when limits are exceeded.
Workarounds
If upgrade is not immediately possible:
- Block requests containing the
next-resumeheader, as this is never valid to be sent from an untrusted client.
Blast Radius
ecosystem impact- 46 npm packages depend on next (44 direct, 2 indirect)
Ecosystem-wide dependent count for version 16.0.1.
Executive ViewAI
CVE-2026-27979 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments. A patch is available and should be applied as part of regular vulnerability management.
Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Exploit-DB