VulnerabilityAnalyzed

CVE-2025-49826

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.

HIGH 7.5EPSS 1.09%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 1.09% probability · 64th percentile
CISA KEV: Not listed
Weakness: CWE-444
Affected: vercel/next.js
Source: security-advisories@github.com

References

https://github.com/vercel/next.js/commit/a15b974ed707d63ad4da5b74c1441f5b7b120e93Patch
https://github.com/vercel/next.js/releases/tag/v15.1.8Release Notes
https://github.com/vercel/next.js/security/advisories/GHSA-67rr-84xm-4c7rVendor Advisory
https://vercel.com/changelog/cve-2025-49826Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.