SB2026101507 - Multiple vulnerabilities in Next.js

Description

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2026-96889)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a memory-related flaw in an upstream library used by the Next.js Image Optimization API when processing SVG files. A remote attacker can supply SVG files for processing to execute arbitrary code.

Exploitation requires Next.js to run on glibc-based Linux.

2) Input validation error (CVE-ID: N/A)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an unspecified flaw in Next.js use cache functions when returning multiple typed arrays. A remote attacker can exploit affected functions to execute arbitrary code.

Exploitation requires an application using App Router with Cache Components.

3) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled CPU resource consumption in the Next.js App Router when processing requests. A remote attacker can send specially crafted requests to cause a denial of service.

Exploitation requires the application to have at least one Server Action. Applications using Pages Router are not affected.

Remediation

Install update from vendor's website.

References

• https://github.com/vercel/next.js/security/advisories/GHSA-2464-fhr4-w9xw
• https://github.com/vercel/next.js/security/advisories/GHSA-673q-mjm6-r5xr
• https://github.com/vercel/next.js/security/advisories/GHSA-p3m5-59mp-jv5r