#VU109239 Race condition in Next.js - CVE-2025-32421

Vulnerability identifier: #VU109239

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-32421

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Next.js
Server applications / Frameworks for developing and running applications

Vendor: Zeit

Description

The vulnerability allows a remote attacker to gain access to sensitive information or perform spoofing attack.

The vulnerability exists due to a race condition within the Pages Router. A remote attacker can exploit the race and obtain pageProps data instead of standard HTML code and poison the CDN cache by injecting the response body from a non-cacheable data request (?__nextDataRequest=1) into a normal request that retains cacheable headers, such as Cache-Control: public, max-age=300.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Next.js: 14.0.0, 14.0.1, 14.0.2, 14.0.3, 14.0.4, 14.1.0, 14.1.1, 14.1.2, 14.1.3, 14.1.4, 14.2.0, 14.2.1, 14.2.2, 14.2.3, 14.2.4, 14.2.5, 14.2.6, 14.2.7, 14.2.8, 14.2.9, 14.2.10, 14.2.11, 14.2.12, 14.2.13, 14.2.14, 14.2.15, 14.2.16, 14.2.17, 14.2.18, 14.2.19, 14.2.20, 14.2.21, 14.2.22, 14.2.23, 15.0.0, 15.0.1, 15.0.2, 15.0.3, 15.0.4, 15.1.0, 15.1.1, 15.1.2, 15.1.3, 15.1.4, 15.1.5

---

External links
https://github.com/vercel/next.js/security/advisories/GHSA-qpjv-v59x-3qc4
https://vercel.com/changelog/cve-2025-32421

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.