CVE-2026-75604: Next.js is a React framework for building full-stack web applications

This week

CRITICAL 9.0REMOTE

CVE-2026-75604 is a critical-severity flaw (CVSS 9.0) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Next.js is a React framework for building full-stack web applications. From 13.4.0 until 15.5.24 and 16.3.3, Next.js applications using Pages Router or App Router without Cache Components on Windows-hosted servers do not consistently escape backslashes in route segments before constructing incremental-cache paths. In packages/next/src/shared/lib/router/utils/escape-path-delimiters.ts and packages/next/src/server/lib/incremental-cache/file-system-

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-09-01
Last modified	2026-09-09

Publisher (CNA): GitHub, Inc.

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-09-01 22:17 UTCPublished CVE record published
2026-09-09 21:09 UTCUpdated Record last modified

Exact fixes by distribution

npm · next · FIXED · 15.5.24 · vulnerable: >= 13.4.0, < 15.5.24 · source

npm install next@">=15.5.24" npm ls next

Fedora 46 · ddnet · FIXED · 20.2-1.fc46 · FEDORA-2026-6991b4ab14 · source

sudo dnf upgrade --advisory=FEDORA-2026-6991b4ab14

Fedora ELN · libplacebo · FIXED · 7.360.1-5.eln159 · FEDORA-2026-92226f221e · source

sudo dnf upgrade --advisory=FEDORA-2026-92226f221e

RHEL 10 · firefox · NOT AFFECTED

RHEL 10 · thunderbird · NOT AFFECTED

RHEL 7 · firefox · NOT AFFECTED

RHEL 8 · firefox · NOT AFFECTED

RHEL 8 · thunderbird · NOT AFFECTED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: ZeroDayEvil/CVE-2026-75604-PoC (178 stars)
GitHub PoC: rafabd1/CVE-2026-75604-poc (106 stars)
GitHub PoC: e4zyy/Project-CVE-2026-75604 (3 stars)
Metasploit: Next.js Unauthenticated RCE on Windows Servers

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-75604?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-75604 being exploited?

CVE-2026-75604 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-75604 affect?

CVE-2026-75604 affects affected software. Severity is critical (CVSS 9.0). Next.js is a React framework for building full-stack web applications. From 13.4.0 until 15.5.24 and 16.3.3, Next.js applications using Pages Router or App Router without Cache Components on Windows-hosted servers do not consistently escape

How urgent is CVE-2026-75604?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

React vulnerabilities · Windows vulnerabilities · Next.js vulnerabilities

References

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