StackPrism

npm package

next 15.4.0 vulnerabilities, and the version that fixes all of them

next 15.4.0 has 35 known vulnerabilities (16 rated high or critical); 15.5.27 fixes all of them. CISA lists 1 of them as exploited in the wild. Next.js 15 reaches end of life on Oct 21, 2026. Move to Next.js 16 (LTS). The maintainers deprecated this release.

npm (opens in a new tab) describes it as “The React Framework”

Known vulnerabilities
35
16 rated high or critical
Released
May 30, 2025
Latest is 16.4.2
Downloads last week
1K
Under 1% of next downloads
Next.js 15 support
Ending soon
Until Oct 21, 2026
Licence
MIT
OpenSSF Scorecard
6.2/10
vercel/next.js (opens in a new tab)
Pulls in
47 packages
Resolved by deps.dev
Status
Deprecated release

What to upgrade to

15.5.27 is the closest release with no known vulnerabilities.

  • 15.5.27Upgrade to this

    Fixes all 35 known vulnerabilities. Released Sep 30, 2026.

    No known vulnerabilities

  • 15.5.28

    Newest 15.x release. Released Oct 14, 2026.

    No known vulnerabilities

  • 16.4.2

    Latest release. Released Oct 15, 2026.

    No known vulnerabilities

15.5.27 came out on Sep 30, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Hand the fix to your coding agent

One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.

Findings

Every advisory for next 15.4.0

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. CriticalGHSA-9qr9-h5gf-34mp on OSV.dev (opens in a new tab)Exploited in the wild (CISA)Used in ransomware

    Next.js is vulnerable to RCE in React flight protocol

    Fixed in 15.4.8. Published Dec 3, 2025.

  2. CriticalGHSA-2xp9-vwfh-vxw4 on OSV.dev (opens in a new tab)

    Next.js: Unauthenticated Remote Code Execution in Image Optimization API when AVIF files are used

    Fixed in 15.5.24. Published Sep 8, 2026.

  3. CriticalCVE-2026-75604 on OSV.dev (opens in a new tab)GHSA-p293-qw3h-jr36

    Next.js: Unauthenticated Remote Code Execution on windows-hosted servers

    Fixed in 15.5.24. Published Sep 8, 2026.

  4. CriticalCVE-2026-64649 on OSV.dev (opens in a new tab)GHSA-89xv-2m56-2m9x

    Next.js: Server-Side Request Forgery in Server Actions on custom servers

    Fixed in 15.5.21. Published Jul 22, 2026.

  5. CriticalCVE-2026-64645 on OSV.dev (opens in a new tab)GHSA-p9j2-gv94-2wf4

    Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname

    Fixed in 15.5.21. Published Jul 22, 2026.

  6. CriticalCVE-2026-64641 on OSV.dev (opens in a new tab)GHSA-m99w-x7hq-7vfj

    Next.js: Denial of Service in App Router using Server Actions

    Fixed in 15.5.21. Published Jul 22, 2026.

  7. CriticalCVE-2026-45109 on OSV.dev (opens in a new tab)GHSA-26hh-7cqf-hhc6

    Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes - Incomplete Fix Follow-Up

    Fixed in 15.5.18. Published May 11, 2026.

  8. CriticalCVE-2026-44579 on OSV.dev (opens in a new tab)GHSA-mg66-mrh9-m8jx

    Next.js vulnerable to Denial of Service via connection exhaustion in applications using Cache Components

    Fixed in 15.5.16. Published May 11, 2026.

  9. CriticalCVE-2026-44578 on OSV.dev (opens in a new tab)GHSA-c4j6-fc7j-m34r

    Next.js vulnerable to server-side request forgery in applications using WebSocket upgrades

    Fixed in 15.5.16. Published May 11, 2026.

  10. CriticalCVE-2026-44575 on OSV.dev (opens in a new tab)GHSA-267c-6grr-h53f

    Next.js has a Middleware / Proxy bypass in App Router applications via segment-prefetch routes

    Fixed in 15.5.16. Published May 11, 2026.

  11. CriticalCVE-2026-44574 on OSV.dev (opens in a new tab)GHSA-492v-c6pp-mqqv

    Next.js has a Middleware / Proxy bypass through dynamic route parameter injection

    Fixed in 15.5.16. Published May 11, 2026.

  12. CriticalCVE-2026-44573 on OSV.dev (opens in a new tab)GHSA-36qx-fr4f-26g5

    Next.js has a Middleware / Proxy bypass in Pages Router applications using i18n

    Fixed in 15.5.16. Published May 11, 2026.

  13. CriticalGHSA-8h8q-6873-q5fj on OSV.dev (opens in a new tab)

    Next.js Vulnerable to Denial of Service with Server Components

    Fixed in 15.5.16. Published May 11, 2026.

  14. CriticalGHSA-q4gf-8mx6-v5v3 on OSV.dev (opens in a new tab)

    Next.js has a Denial of Service with Server Components

    Fixed in 15.5.15. Published Apr 10, 2026.

  15. CriticalGHSA-h25m-26qc-wcjf on OSV.dev (opens in a new tab)

    Next.js HTTP request deserialization can lead to DoS when using insecure React Server Components

    Fixed in 15.4.11. Published Jan 28, 2026.

  16. CriticalGHSA-mwv6-3258-q52c on OSV.dev (opens in a new tab)

    Next Vulnerable to Denial of Service with Server Components

    Fixed in 15.4.9. Published Dec 11, 2025.

  17. WarningCVE-2026-94543 on OSV.dev (opens in a new tab)GHSA-4jqv-mc3x-m676

    Next.js has cache poisoning of SSG and ISR pages in self-hosted applications

    Fixed in 15.5.27. Published Oct 7, 2026.

  18. WarningCVE-2026-94484 on OSV.dev (opens in a new tab)GHSA-mcj8-r9mp-w47p

    Next.js has cache poisoning in SSG/ISR rendering that leads to cross-user content substitution and persistent denial of service

    Fixed in 15.5.27. Published Oct 7, 2026.

  19. WarningCVE-2026-64648 on OSV.dev (opens in a new tab)GHSA-68g3-v927-f742

    Next.js: Cache confusion of response bodies for requests with bodies

    Fixed in 15.5.21. Published Jul 22, 2026.

  20. WarningCVE-2026-64647 on OSV.dev (opens in a new tab)GHSA-4633-3j49-mh5q

    Next.js: Cache confusion of response bodies for requests with bodies containing invalid UTF-8 byte sequences

    Fixed in 15.5.21. Published Jul 22, 2026.

  21. WarningCVE-2026-64646 on OSV.dev (opens in a new tab)GHSA-4c39-4ccg-62r3

    Next.js: Unbounded Server Action payload in Edge runtime

    Fixed in 15.5.21. Published Jul 22, 2026.

  22. WarningCVE-2026-64643 on OSV.dev (opens in a new tab)GHSA-955p-x3mx-jcvp

    Next.js: Unauthenticated disclosure of internal Server Function endpoints

    Fixed in 15.5.21. Published Jul 22, 2026.

  23. WarningCVE-2026-44581 on OSV.dev (opens in a new tab)GHSA-ffhc-5mcf-pf4q

    Next.js vulnerable to cross-site scripting in App Router applications using CSP nonces

    Fixed in 15.5.16. Published May 11, 2026.

  24. WarningCVE-2026-44580 on OSV.dev (opens in a new tab)GHSA-gx5p-jg67-6x7h

    Next.js has cross-site scripting in beforeInteractive scripts with untrusted input

    Fixed in 15.5.16. Published May 11, 2026.

  25. WarningCVE-2026-44577 on OSV.dev (opens in a new tab)GHSA-h64f-5h5j-jqjh

    Next.js has a Denial of Service in the Image Optimization API

    Fixed in 15.5.16. Published May 11, 2026.

  26. WarningCVE-2026-44576 on OSV.dev (opens in a new tab)GHSA-wfc6-r584-vfw7

    Next.js vulnerable to cache poisoning in React Server Component responses

    Fixed in 15.5.16. Published May 11, 2026.

  27. WarningCVE-2026-29057 on OSV.dev (opens in a new tab)GHSA-ggv3-7p47-pfv8

    Next.js: HTTP request smuggling in rewrites

    Fixed in 15.5.13. Published Mar 17, 2026.

  28. WarningCVE-2026-27980 on OSV.dev (opens in a new tab)GHSA-3x4c-7xq6-9pq8

    Next.js: Unbounded next/image disk cache growth can exhaust storage

    Fixed in 15.5.14. Published Mar 17, 2026.

  29. WarningCVE-2025-59471 on OSV.dev (opens in a new tab)GHSA-9g9p-9gw9-jx7f

    Next.js self-hosted applications vulnerable to DoS via Image Optimizer remotePatterns configuration

    Fixed in 15.5.10. Published Jan 27, 2026.

  30. WarningGHSA-w37m-7fhw-fmv9 on OSV.dev (opens in a new tab)

    Next Server Actions Source Code Exposure

    Fixed in 15.4.9. Published Dec 11, 2025.

  31. WarningCVE-2025-57752 on OSV.dev (opens in a new tab)GHSA-g5qg-72qw-gw5v

    Next.js Affected by Cache Key Confusion for Image Optimization API Routes

    Fixed in 15.4.5. Published Aug 29, 2025.

  32. WarningCVE-2025-55173 on OSV.dev (opens in a new tab)GHSA-xv57-4mr9-wg8v

    Next.js Content Injection Vulnerability for Image Optimization

    Fixed in 15.4.5. Published Aug 29, 2025.

  33. WarningCVE-2025-57822 on OSV.dev (opens in a new tab)GHSA-4342-x723-ch2f

    Next.js Improper Middleware Redirect Handling Leads to SSRF

    Fixed in 15.4.7. Published Aug 29, 2025.

  34. LowCVE-2026-44572 on OSV.dev (opens in a new tab)GHSA-3g8h-86w9-wvmq

    Next.js's Middleware / Proxy redirects can be cache-poisoned

    Fixed in 15.5.16. Published May 11, 2026.

  35. LowCVE-2026-44582 on OSV.dev (opens in a new tab)GHSA-vfv6-92ff-j949

    Next.js vulnerable to cache poisoning via collisions in React Server Component cache-busting

    Fixed in 15.5.16. Published May 11, 2026.

Who is still on a vulnerable next

59% of last week’s 41M next downloads went to versions with known vulnerabilities.

From npm’s per-version download counts for the last 7 days, each version checked against OSV.dev. The versions checked cover over 99% of downloads.

Is next the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly next 15.4.0, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and npm, support dates from endoflife.date. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against npm, OSV.dev, deps.dev, CISA KEV, FIRST EPSS (didn’t answer) and endoflife.date. Findings from that source may be missing; this page refreshes soon.