What is the CVSS score of CVE-2025-49826?

CVE-2025-49826 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Next.Js are affected by CVE-2025-49826?

Organizations using Next.js face notable risk from CVE-2025-49826 rated CVSS 7.5. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2025-49826?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

Next.Js CVE-2025-49826

EUVD-2025-19910 HIGH

HTTP Request/Response Smuggling (CWE-444)

2025-07-03 security-advisories@github.com

GHSA-67rr-84xm-4c7r

Denial Of Service Next.Js Red Hat Vercel

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Red Hat

5.3 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 16, 2026 - 02:12 euvd

EUVD-2025-19910

Analysis Generated

Mar 16, 2026 - 02:12 vuln.today

Patch released

Mar 16, 2026 - 02:12 nvd

Patch available

CVE Published

Jul 03, 2025 - 21:15 nvd

HIGH 7.5

DescriptionGitHub Advisory

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.

Analysis

Technical ContextAI

A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users. This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444).

RemediationAI

A vendor patch is available — apply it immediately. Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.