---
cve: "CVE-2026-27979"
severity: "MEDIUM"
cvss: 6.9
epss: "67%"
vendor: "vercel"
kev: false
exploited: false
published: "2026-03-18 01:16:04"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T10:27:27+02:00"
---

# CVE-2026-27979

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- bdf3e3577a6d55ea186a48238d61fbd8da07a626 (Commit)
- c885d4825f800dd1e49ead37274dcd08cdd6f3f1 (Commit)

## Referenzen

- <https://github.com/vercel/next.js/security/advisories/GHSA-h27x-g6w4-24gq>
- <https://github.com/vercel/next.js/commit/c885d4825f800dd1e49ead37274dcd08cdd6f3f1>
- <https://github.com/vercel/next.js/releases/tag/v16.1.7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-27979) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_