Sign in
Deutsch English Español Polski
Medium

Denial of Service Vulnerability in next.js

  • Disclosed: 28.01.2022
  • Updated: 11.10.2026 10:22

Impact

Vulnerable code could allow a bad actor to trigger a denial of service attack for anyone running a Next.js app at version >= 12.0.0, and using i18n functionality.

  • Affected: All of the following must be true to be affected by this CVE
    • Next.js versions above v12.0.0
    • Using next start or a custom server
    • Using the built-in i18n support
  • Not affected:
    • Deployments on Vercel (vercel.com) are not affected along with similar environments where invalid requests are filtered before reaching Next.js.

Patches

A patch has been released, next@12.0.9, that mitigates this issue. We recommend all affected users upgrade as soon as possible.

Workarounds

We recommend upgrading whether you can reproduce or not although you can ensure /${locale}/_next/ is blocked from reaching the Next.js instance until you upgrade.

For more information

If you have any questions or comments about this advisory:

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package next >= 12.0.0, < 12.0.9 12.0.9

References

CVSS score 5.9/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-20, CWE-400
Platform
npm
Package
next
Disclosed
28.01.2022
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-wr66-vrwm-5g5x - CC BY 4.0

Vulnerability history: next

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (73) in the archive
Total entries
73
First → latest
12.2017 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 5
  • High 27
  • Medium 32
  • Low 9

Disclosures per year

Severity:
  1. Next.js has Server-Side Request Forgery in Image Optimization
    High · 6.5 CVE-2026-94483 >= 16.0.0, < 16.3.8 16.3.8
  2. Next.js: Remote Code Execution in next/og ImageResponse
    Critical ghsa-vcvr-r3jv-pc5j >= 16.2.0, < 16.3.6 16.3.6
  3. Next.js: Unauthenticated Remote Code Execution in Image Optimization API when AVIF files are used
    Critical ghsa-2xp9-vwfh-vxw4 >= 10.0.0, < 15.5.24, >= 16.0.0, < 16.3.3 15.5.24, 16.3.3
  4. Next.js: Unauthenticated Remote Code Execution on windows-hosted servers
    Critical · 9.0 CVE-2026-75604 >= 13.4.0, < 15.5.24, >= 16.0.0, < 16.3.3 15.5.24, 16.3.3
  5. Next.js: Server-Side Request Forgery in Server Actions on custom servers
    High CVE-2026-64649 >= 14.1.1, < 15.5.21, >= 16.0.0, < 16.2.11 15.5.21, 16.2.11
  6. Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
    High CVE-2026-64645 >= 12.0.0, < 15.5.21, >= 16.0.0, < 16.2.11 15.5.21, 16.2.11
  7. Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
    High CVE-2026-64642 >= 16.0.0, < 16.2.11 16.2.11
  8. Next.js: Denial of Service in App Router using Server Actions
    High CVE-2026-64641 >= 13.0.0, < 15.5.21, >= 16.0.0, < 16.2.11 15.5.21, 16.2.11
  9. Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up
    High · 7.5 CVE-2026-45109 >= 15.2.0, < 15.5.18, >= 16.0.0, < 16.2.6 15.5.18, 16.2.6
  10. Next.js vulnerable to Denial of Service via connection exhaustion in applications using Cache Components
    High · 7.5 CVE-2026-44579 >= 15.0.0, < 15.5.16, >= 16.0.0, < 16.2.5 15.5.16, 16.2.5
  11. Next.js vulnerable to server-side request forgery in applications using WebSocket upgrades
    High · 8.6 CVE-2026-44578 >= 13.4.13, < 15.5.16, >= 16.0.0, < 16.2.5 15.5.16, 16.2.5
  12. Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes
    High · 7.5 CVE-2026-44575 >= 15.2.0, < 15.5.16, >= 16.0.0, < 16.2.5 15.5.16, 16.2.5
  13. Next.js has a Middleware / Proxy bypass through dynamic route parameter injection
    High · 8.1 CVE-2026-44574 >= 15.4.0, < 15.5.16, >= 16.0.0, < 16.2.5 15.5.16, 16.2.5
  14. Next.js has a Middleware / Proxy bypass in Pages Router applications using i18n
    High · 7.5 CVE-2026-44573 >= 12.2.0, < 15.5.16, >= 16.0.0, < 16.2.5 15.5.16, 16.2.5
  15. Next.js Vulnerable to Denial of Service with Server Components
    High · 7.5 ghsa-8h8q-6873-q5fj >= 13.0.0, < 15.5.16, >= 16.0.0, < 16.2.5 15.5.16, 16.2.5
  16. Next.js has a Denial of Service with Server Components
    High · 7.5 ghsa-q4gf-8mx6-v5v3 >= 13.0.0, < 15.5.15, >= 16.0.0-beta.0, < 16.2.3 15.5.15, 16.2.3
  17. Next.js HTTP request deserialization can lead to DoS when using insecure React Server Components
    High · 7.5 ghsa-h25m-26qc-wcjf >= 13.0.0, < 15.0.8, >= 15.1.1-canary.0, < 15.1.12, >= 15.2.0-canary.0, < 15.2.9, >= 15.3.0-canary.0, < 15.3.9, >= 15.4.0-canary.0, < 15.4.11, >= 15.5.1-canary.0, < 15.5.10, >= 15.6.0-canary.0, < 15.6.0-canary.61, >= 16.0.0-beta.0, < 16.0.11, >= 16.1.0-canary.0, < 16.1.5 15.0.8, 15.1.12, 15.2.9, 15.3.9, 15.4.11, 15.5.10, 15.6.0-canary.61, 16.0.11, 16.1.5
  18. Next has a Denial of Service with Server Components - Incomplete Fix Follow-Up
    High · 7.5 ghsa-5j59-xgg2-r9c4 >= 13.3.1-canary.0, < 14.2.35, >= 15.0.6, < 15.0.7, >= 15.1.10, < 15.1.11, >= 15.2.7, < 15.2.8, >= 15.3.7, < 15.3.8, >= 15.4.9, < 15.4.10, >= 15.5.8, < 15.5.9, >= 15.6.0-canary.59, < 15.6.0-canary.60, >= 16.0.9, < 16.0.10, >= 16.1.0-canary.17, < 16.1.0-canary.19 14.2.35, 15.0.7, 15.1.11, 15.2.8, 15.3.8, 15.4.10, 15.5.9, 15.6.0-canary.60, 16.0.10, 16.1.0-canary.19
  19. Next Vulnerable to Denial of Service with Server Components
    High · 7.5 ghsa-mwv6-3258-q52c >= 13.3.0, < 14.2.34, >= 15.0.0-canary.0, < 15.0.6, >= 15.1.1-canary.0, < 15.1.10, >= 15.2.0-canary.0, < 15.2.7, >= 15.3.0-canary.0, < 15.3.7, >= 15.4.0-canary.0, < 15.4.9, >= 15.5.1-canary.0, < 15.5.8, >= 15.6.0-canary.0, < 15.6.0-canary.59, >= 16.0.0-beta.0, < 16.0.9, >= 16.1.0-canary.0, < 16.1.0-canary.17 14.2.34, 15.0.6, 15.1.10, 15.2.7, 15.3.7, 15.4.9, 15.5.8, 15.6.0-canary.59, 16.0.9, 16.1.0-canary.17
  20. Next.js is vulnerable to RCE in React flight protocol
    Critical · 10.0 ghsa-9qr9-h5gf-34mp >= 14.3.0-canary.77, < 15.0.5, >= 15.1.0-canary.0, < 15.1.9, >= 15.2.0-canary.0, < 15.2.6, >= 15.3.0-canary.0, < 15.3.6, >= 15.4.0-canary.0, < 15.4.8, >= 15.5.0-canary.0, < 15.5.7, >= 16.0.0-canary.0, < 16.0.7 15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7
  21. Next.JS vulnerability can lead to DoS via cache poisoning
    High · 7.5 CVE-2025-49826 >= 15.0.4-canary.51, < 15.1.8 15.1.8
  22. Authorization Bypass in Next.js Middleware
    Critical · 9.1 CVE-2025-29927 >= 13.0.0, < 13.5.9, >= 14.0.0, < 14.2.25, >= 15.0.0, < 15.2.3, >= 12.0.0, < 12.3.5 13.5.9, 14.2.25, 15.2.3, 12.3.5
  23. Next.js authorization bypass vulnerability
    High · 7.5 CVE-2024-51479 >= 9.5.5, < 14.2.15 14.2.15
  24. Next.js Cache Poisoning
    High · 7.5 CVE-2024-46982 >= 13.5.1, < 13.5.7, >= 14.0.0, < 14.2.10 13.5.7, 14.2.10
  25. Next.js Denial of Service (DoS) condition
    High · 7.5 CVE-2024-39693 >= 13.3.1, < 13.5.0 13.5.0
  26. Next.js Server-Side Request Forgery in Server Actions
    High · 7.5 CVE-2024-34351 >= 13.4.0, < 14.1.1 14.1.1
  27. Next.js Vulnerable to HTTP Request Smuggling
    High · 7.5 CVE-2024-34350 >= 13.4.0, < 13.5.1 13.5.1
  28. Denial of Service Vulnerability in next.js this entry
    Medium · 5.9 CVE-2022-21721 >= 12.0.0, < 12.0.9 12.0.9
  29. Unexpected server crash in Next.js.
    High · 7.5 CVE-2021-43803 >= 12.0.0, < 12.0.5, >= 0.9.9, < 11.1.3 12.0.5, 11.1.3
  30. XSS in Image Optimization API for Next.js
    High · 7.5 CVE-2021-39178 >= 10.0.0, < 11.1.1 11.1.1
  31. Remote Code Execution in next
    High ghsa-5vj8-3v2h-h38v >= 0.9.9, < 5.1.0 5.1.0
  32. Directory traversal vulnerability in Next.js
    High · 7.5 CVE-2018-6184 >= 1.0.0, < 4.2.3 4.2.3
  33. Next.js Directory Traversal Vulnerability
    High · 7.5 CVE-2017-16877 >= 1.0.0, < 2.4.1 2.4.1

Know which vulnerabilities affect your application

With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.

Connect your application
DockRay newsletter

Application security in your inbox

Important vulnerabilities, actionable guidance and practical advice for your applications. Choose your technologies and follow what matters to your project.

  • A daily digest of new vulnerabilities, critical ones included.
  • Notifications about important updates.
  • Practical advice on application security and monitoring.

Leave empty to receive updates for every technology.

Privacy policy

Free to subscribe. Unsubscribe with one click in any email.