vercel next.js up to 15.5.15/16.2.4 acceptance of extraneous untrusted data with trusted data

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in vercel next.js up to 15.5.15/16.2.4 and classified as problematic. Affected by this issue is some unknown functionality. Performing a manipulation results in acceptance of extraneous untrusted data with trusted data. This vulnerability is cataloged as CVE-2026-44572. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in vercel next.js up to 15.5.15/16.2.4. This affects an unknown part. The manipulation with an unknown input leads to a acceptance of extraneous untrusted data with trusted data vulnerability. CWE is classifying the issue as CWE-349. The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted. This is going to have an impact on availability. The summary by CVE is:

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 external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-44572 since 05/06/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 316647 (Linux Distros Unpatched Vulnerability : CVE-2026-44572), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 15.5.16 or 16.2.5 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (316647) and CERT Bund (WID-SEC-2026-1401). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Vercel Next.js

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔒

CNA Base Score: 3.7
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Acceptance of extraneous untrusted data with trusted data
CWE: CWE-349
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 316647
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-44572

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: next.js 15.5.16/16.2.5

Timelineinfo

05/06/2026 CVE reserved
05/13/2026 +7 days Advisory disclosed
05/13/2026 +0 days VulDB entry created
05/26/2026 +13 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-44572 (🔒)
GCVE (CVE): GCVE-0-2026-44572
GCVE (VulDB): GCVE-100-363639
CERT Bund: WID-SEC-2026-1401 - Vercel Next.js: Mehrere Schwachstellen

Entryinfo

Created: 05/13/2026 18:24
Updated: 05/26/2026 02:07
Changes: 05/13/2026 18:24 (63), 05/14/2026 13:12 (7), 05/19/2026 09:32 (11), 05/26/2026 02:07 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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