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Vulnerabilities

Vulnerability · CVE-2026-27979

Next.js is a React framework for building full-stack web applications.

Published Mar 18, 2026 · catalog updated Jun 17, 2026 · Next.js is a React

Check if you run it

No confirmed exploitation is on record for CVE-2026-27979. EPSS is 0.87%. Act only if a listed version of Next.js is a React is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Next.js is a React).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.87%
Remediation
Advisory link
Affected products
cpe 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe vercel/next.jsversion unspecified

How to fix CVE-2026-27979

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-27979. EPSS is 0.87%. Act only if a listed version of Next.js is a React is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.87%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. 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

  2. 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

Sources

  • CVE.orgVulnerability recordCVE-2026-27979

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-27979

    30-day exploitation probability 0.9%

    first.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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.