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CVE-2026-27979

⚠ī¸ high
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Summary

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 behavio

Description

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 Score
7.5
High
EPSS Score
0.0
Exploit Probability
Published Date
2026-03-18
First Seen: 2026-03-19
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.1% of all 321,200 vulnerabilities in our database.

#99,390
Above average severity
Severity Percentile
đŸŽ¯ CISA SSVC Assessment Updated: Mar 18, 2026
🔍 Exploitation Status
None
No known exploits
⚙ī¸ Automatable
YES
Can be exploited automatically
đŸ’Ĩ Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-03-18
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Vector 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE IDs (Weakness Types)
CWE-770

đŸ“Ļ Affected Products 1

Vendor Product Status Affected Versions
vercel next.js Affected
> 16.0.1 < 16.1.7

🔗 References 3

https://github.com/vercel/next.js/commit/c885d4825f8...
Patch
https://github.com/vercel/next.js/releases/tag/v16.1.7
Release Notes
https://github.com/vercel/next.js/security/advisorie...
Vendor Advisory Mitigation

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-44572 ℹī¸ low 3.7 0.0 Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an exte... 2026-05-13
CVE-2026-44573 ⚠ī¸ high 7.5 0.0 Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, Applica... 2026-05-13
CVE-2026-44574 ⚠ī¸ high 8.1 0.0 Next.js is a React framework for building full-stack web applications. From 15.4.0 to before 15.5.16 and 16.2.5, applica... 2026-05-13
CVE-2026-44575 ⚠ī¸ high 7.5 0.0 Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Rou... 2026-05-13
CVE-2026-44576 đŸ”ļ medium 5.4 0.0 Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applica... 2026-05-13
CVE-2026-44578 ⚠ī¸ high 8.6 4.0 Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-h... 2026-05-13
These CVEs affect the same products