# CVE-2025-49826: Next.js DoS vulnerability via cache poisoning

> CVE-2025-49826: Next.js DoS vulnerability via cache poisoning. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-49826
Last updated: 2026-06-17T09:31:57Z

- Published: 2025-07-03 21:03 UTC · Updated: 2026-06-17 09:31 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 1.1%, 66th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-444

## Description

Next.js is a React framework for building full-stack web applications. From versions 15.0.4-canary.51 to before 15.1.8, a cache poisoning bug leading to a Denial of Service (DoS) condition was found in Next.js. This issue does not impact customers hosted on Vercel. Under certain conditions, this issue may allow a HTTP 204 response to be cached for static pages, leading to the 204 response being served to all users attempting to access the page. This issue has been addressed in version 15.1.8.

## Affected vendors and products

- vercel: next.js

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-49826)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-49826)
- [https://github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93](https://github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93)
- [https://github.com/vercel/next.js/releases/tag/v15.1.8](https://github.com/vercel/next.js/releases/tag/v15.1.8)
- [https://github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7r](https://github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7r)
- [https://vercel.com/changelog/cve-2025-49826](https://vercel.com/changelog/cve-2025-49826)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-49826 · Markdown: https://rewindex.com/cve/CVE-2025-49826.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-49826 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:42.176Z