GHSA-h27x-g6w4-24gq

Source

https://github.com/advisories/GHSA-h27x-g6w4-24gq

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-h27x-g6w4-24gq/GHSA-h27x-g6w4-24gq.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-h27x-g6w4-24gq

Aliases

CVE-2026-27979

Published

2026-03-17T16:16:49Z

Modified

2026-03-19T18:48:06.587119Z

Severity

6.9 (Medium) CVSS_V4 - 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 CVSS Calculator

Summary

Next.js: Unbounded postponed resume buffering can lead to DoS

Details

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-resume header, as this is never valid to be sent from an untrusted client.

Database specific

{
    "github_reviewed_at": "2026-03-17T16:16:49Z",
    "nvd_published_at": "2026-03-18T01:16:04Z",
    "cwe_ids": [
        "CWE-770"
    ],
    "severity": "MODERATE",
    "github_reviewed": true
}

References

Affected packages

npm / next

Package

Name: next; View open source insights on deps.dev
Purl: pkg:npm/next

Affected ranges

Type: SEMVER
Events: Introduced

16.0.1

Fixed

16.1.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-h27x-g6w4-24gq/GHSA-h27x-g6w4-24gq.json"