SB2026082633 - Multiple vulnerabilities in Next.js

Description

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow (CVE-ID: N/A)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/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 memory corruption in the libheif library used by the Image Optimization API when processing AVIF files for image optimization. A remote attacker can supply a specially crafted AVIF file to execute arbitrary code.

2) Path traversal (CVE-ID: CVE-2026-75604) Exploited

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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 path traversal in Pages and App router without Cache Component when handling requests on servers hosted on a Windows filesystem. A remote attacker can send a specially crafted request to execute arbitrary code.

Only applications using Pages and App router without Cache Component on Windows-hosted servers are vulnerable.

Remediation

Install update from vendor's website.

References

• https://github.com/vercel/next.js/security/advisories/GHSA-2xp9-vwfh-vxw4
• https://github.com/vercel/next.js/security/advisories/GHSA-p293-qw3h-jr36