Quick answers
- Is CVE-2026-75604 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-75604 being exploited in the wild.
- How severe is CVE-2026-75604?
- Critical severity, with a CVSS score of 9, published 1 September 2026.
- Which products and versions are affected?
- next (npm) SEMVER:introduced=13.4.0,fixed=15.5.24; Vercel Next.js >=13.4.0, <15.5.24; >=16.0.0, <16.3.3.
- Is there a fix for CVE-2026-75604?
- Yes. next (npm): upgrade to 15.5.24 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-75604 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-75604?
- Check whether you run next (npm) or Vercel Next.js at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- next (npm): upgrade to 15.5.24 or later
npm install next@15.5.24
Technical details
This vulnerability is a path traversal (CWE-22) flaw in Next.js versions 13.4.0 through 15.5.23 and 16.0.0 through 16.3.2 affecting applications deployed on Windows filesystem. The flaw exists in the routing system when using Pages or App router without Cache Component enabled. An unauthenticated attacker over the network can send specially crafted requests that traverse the directory structure due to improper pathname handling on Windows systems, bypassing path restrictions. The attack vector is network-based with high complexity but requires no authentication or user interaction. Successful exploitation results in remote code execution with full system impact including data confidentiality, integrity, and availability compromise. Patches are available in versions 15.5.24 and 16.3.3.
Affected products
- Vercel Next.js >=13.4.0, <15.5.24; >=16.0.0, <16.3.3
Identifiers
- CVE-2026-75604
- GHSA-p293-qw3h-jr36
Timeline
- 2026-08-25: disclosed: Published by security researcher
- 2026-09-01: advisory: NVD published
- 2026-09-08: advisory: GitHub Advisory Database published and reviewed
- 2026: patched: Patched in versions 15.5.24 and 16.3.3
References
- https://api.github.com/users/evolutionstorm
- https://github.com/evolutionstorm
- https://api.github.com/users/evolutionstorm/gists%7B/gist_id%7D
- https://api.github.com/users/evolutionstorm/repos
- https://avatars.githubusercontent.com/u/51437180?v=4
- https://api.github.com/users/evolutionstorm/events%7B/privacy%7D