Packages / next / Security

HighVulnerabilityGHSA-5j59-xgg2-r9c4Published 12 Dec 2025

Next has a Denial of Service with Server Components - Incomplete Fix Follow-Up

Affected releases · next

  • 16.x16.0.9Fixed in 16.0.10
  • 15.x15.0.6 – 15.5.8Fixed in 15.5.9
  • 14.x14.0.0 – 14.2.34Fixed in 14.2.35
  • 13.x13.3.1 – 13.5.11No fix on this line yet

On 16.x, the newest line:

npm install next@16.0.10
16.x

  1. Not affected

    16.0.0 – 16.0.8

    9 releases

  2. Affected

    16.0.9

    1 release

  3. Fixed

    16.0.10 – 16.4.2

    35 releases, latest

15.x

  1. Not affected

    15.0.0 – 15.0.5

    6 releases

  2. Affected

    15.0.6

    1 release

  3. Fixed

    15.0.7 – 15.1.9

    12 releases

  4. Affected

    15.1.10

    1 release

  5. Fixed

    15.1.11 – 15.2.6

    9 releases

  6. Affected

    15.2.7

    1 release

  7. Fixed

    15.2.8 – 15.3.6

    9 releases

  8. Affected

    15.3.7

    1 release

  9. Fixed

    15.3.8 – 15.4.8

    11 releases

  10. Affected

    15.4.9

    1 release

  11. Fixed

    15.4.10 – 15.5.7

    10 releases

  12. Affected

    15.5.8

    1 release

  13. Fixed

    15.5.9 – 15.5.28

    19 releases

14.x

  1. Affected

    14.0.0 – 14.2.34

    45 releases

  2. Fixed

    14.2.35

    1 release

13.x

  1. Not affected

    13.0.0 – 13.3.0

    21 releases

  2. Affected

    13.3.1 – 13.5.11

    35 releases

423 stable releases of next, oldest to newest, one row per major.

Is your project affected?

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What happens

It was discovered that the fix for CVE-2025-55184 in React Server Components was incomplete and did not fully mitigate denial-of-service conditions across all payload types. As a result, certain crafted inputs could still trigger excessive resource consumption.

This vulnerability affects React versions 19.0.2, 19.1.3, and 19.2.2, as well as frameworks that bundle or depend on these versions, including Next.js 13.x, 14.x, 15.x, and 16.x when using the App Router. The issue is tracked upstream as CVE-2025-67779.

A malicious actor can send a specially crafted HTTP request to a Server Function endpoint that, when deserialized, causes the React Server Components runtime to enter an infinite loop. This can lead to sustained CPU consumption and cause the affected server process to become unresponsive, resulting in a denial-of-service condition in unpatched environments.