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CVE

CVE-2025-66478

CVE-2025-66478 was originally reported as a Remote Code Execution (RCE) vulnerability in Next.js, caused by insecure deserialization in the React Flight protocol. The issue impacted frameworks using vulnerable React versions, including Next.js 15.x and 16.x with the App Router. Although the vulnerability was later rejected by the NVD as a duplicate of CVE-2025-55182, this rejection overlooks a critical detail: Next.js does not consume the vulnerable React code as a dependency, but instead rebundles (vendors) it internally. As a result, standard dependency-based detection tools fail to flag this issue in Next.js projects.
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CVE

CVE-2025-66478

CVE-2025-66478 was originally reported as a Remote Code Execution (RCE) vulnerability in Next.js, caused by insecure deserialization in the React Flight protocol. The issue impacted frameworks using vulnerable React versions, including Next.js 15.x and 16.x with the App Router. Although the vulnerability was later rejected by the NVD as a duplicate of CVE-2025-55182, this rejection overlooks a critical detail: Next.js does not consume the vulnerable React code as a dependency, but instead rebundles (vendors) it internally. As a result, standard dependency-based detection tools fail to flag this issue in Next.js projects.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
0
-
C
H
U
-
C
H
U
10
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

Severity

10

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
10
EPSS Probability
0%
EPSS Percentile
0%
Introduced Version
16.0.0-beta.0,16.0.0-canary.0,15.6.0-canary.0,15.5.0,15.4.0-canary.0,15.3.0-canary.0,15.2.0-canary.0,15.1.0,14.3.0-canary.77
Fix Available
16.1.0-canary.12,16.0.7,15.6.0-canary.58,15.5.7,15.4.8,15.3.6,15.2.6,15.1.9,15.0.5

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