CVE-2026-75604

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 2.5%, top 16% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Weaponized
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, public exploit)
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.0Exploit: Metasploit · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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-cache.ts, a remote request can supply encoded Windows path separators that traverse outside the intended cache root and expose private build data, including the server-reference-manifest encryption key. Disclosure of that key can enable remote code execution in the affected application. This issue is fixed in versions 15.5.24 and 16.3.3.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
67(Track)
EG Risk 67/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation65% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
84%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 9, 2026

Advisory Details (5)

Auto-updated Sep 1, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v16.3.3

Patch available: vercel/next.js v16.3.3

https://github.com/vercel/next.js/releases/tag/v16.3.3
github_release Patch Available

v15.5.24

Patch available: vercel/next.js v15.5.24

https://github.com/vercel/next.js/releases/tag/v15.5.24
github_commit Patch Available

commit b0f3460a92b9 (vercel/next.js)

Patch available: vercel/next.js v15.5.24 (contains commit b0f3460a92b9)

https://github.com/vercel/next.js/commit/b0f3460a92b955d3ca41fccff9a525a2b910fbf3
github_commit Patch Available

commit 968b9fcb26bd (vercel/next.js)

Patch available: vercel/next.js v16.3.3 (contains commit 968b9fcb26bd)

https://github.com/vercel/next.js/commit/968b9fcb26bdeb8e0a861a9df05361474666d51b
github Patch Available

Unauthenticated Remote Code Execution on windows-hosted servers · Advisory · vercel/next.js · GitHub

https://github.com/vercel/next.js/security/advisories/GHSA-p293-qw3h-jr36

Vendor Advisories for CVE-2026-75604(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
next—16.3.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 21:24 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 20:40 UTCEG score recompute
  4. 2026-09-16 18:38 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 09:10 UTCEG score recompute
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 05:16 UTCEG score recompute
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-13 17:19 UTCEG score recompute
  11. 2026-09-12 17:23 UTCEG score recompute
  12. 2026-09-12 15:02 UTCEPSS rescore
  13. 2026-09-11 17:26 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 13:06 UTCEG score recompute
  16. 2026-09-10 13:09 UTCEG score recompute
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-08 23:18 UTCEG score recompute
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-07 18:53 UTCEG score recompute
  21. 2026-09-06 16:21 UTCEG score recompute
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-05 16:26 UTCEG score recompute
  24. 2026-09-04 20:28 UTCEG score recompute
  25. 2026-09-04 20:05 UTCEG score recompute
Show 10 more
  1. 2026-09-04 17:21 UTCEG score recompute
  2. 2026-09-04 05:18 UTCEG score recompute
  3. 2026-09-04 05:07 UTCEPSS rescore
  4. 2026-09-03 13:16 UTCEG score recompute
  5. 2026-09-03 07:56 UTCEG score recompute
  6. 2026-09-02 14:21 UTCEG score recompute
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 22:19 UTCEG score recompute
  9. 2026-09-01 21:33 UTCEG score recompute
  10. 2026-09-01 21:32 UTCMITRE cvelistV5first tracked

Publicly available exploits

(4 references)

Working exploit code is in the public domain (1 Metasploit module) (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCe4zyy/Project-CVE-2026-75604
    First seen Aug 27, 2026

    A Python-based exploitation framework for CVE-2026-75604 that enables authorized penetration testers to validate Next.js Windows cache traversal vulnerabilities. Deploys reverse shells and webshells via path traversal, with built-in target verification and proxy support for seamless integration into standard pentest workflows.

    Open source ↗
  • GitHub PoCHackSpeak/CVE-2026-75604
    First seen Aug 26, 2026

    CVE-2026-75604 (Next.js Windows RCE) PoC - unauthenticated RCE via cache path traversal + forged Server Action; for authorized security testing

    Open source ↗
  • Metasploitexploit/windows/http/nextjs_unauth_rce_cve_2026_75604✓ verified
    First seen Aug 26, 2026

    Next.js Unauthenticated RCE on Windows Servers

    Open source ↗
  • GitHub PoCrafabd1/CVE-2026-75604-poc
    First seen Aug 25, 2026

    CVE-2026-75604 Next.js Windows RCE poc

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-75604?
CVE-2026-75604 is a critical vulnerability published on September 1, 2026. 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…
When was CVE-2026-75604 disclosed?
CVE-2026-75604 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75604 actively exploited?
CVE-2026-75604 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 16.3% of all scored CVEs.
What is the CVSS score of CVE-2026-75604?
CVE-2026-75604 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-75604?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75604, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-75604

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