Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-27T17:54:52 next: Next.js: Denial of Service via malicious image optimization 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-770

Next.js is a React framework for building full-stack web applications. In versions 15.5.0 through 15.5.20 and 16.0.0 through 16.2.10, when self-hosting Next.js with the default image loader, the Image Optimization API can optimize remotely hosted images if configured (not enabled by default). If those images contain malicious content, they can cause CPU exhaustion in /_next/image endpoints.Only config.images.remotePatterns is affected, and just the patterns in that array, whereas config.images.unoptimized: true, config.images.loader: 'custom', and Vercel are not impacted. This issue has been fixed in versions 15.5.21 and 16.2.11.

A flaw was found in Next.js, a React framework. When self-hosting Next.js with the default image loader and configured to optimize remotely hosted images, a remote attacker could exploit the Image Optimization API. By providing malicious images, the attacker can cause CPU exhaustion, leading to a Denial of Service (DoS) in the /_next/image endpoints. This vulnerability specifically affects configurations using config.images.remotePatterns.

This is an Important denial of service vulnerability in Next.js applications. When self-hosting Next.js with the default image loader, the Image Optimization API can be exploited if the `config.images.remotePatterns` option is explicitly configured to optimize remotely hosted, malicious images. This configuration is not enabled by default in Red Hat supported products, limiting exposure to environments where this specific feature has been activated. Red Hat Enterprise Linux 10 Affected firefox Red Hat Enterprise Linux 10 Affected thunderbird Red Hat Enterprise Linux 7 Affected firefox Red Hat Enterprise Linux 8 Affected firefox Red Hat Enterprise Linux 8 Affected thunderbird Red Hat Enterprise Linux 9 Affected firefox Red Hat Enterprise Linux 9 Affected thunderbird Red Hat Enterprise Linux AI (RHEL AI) 3 Not affected rhelai3/bootc-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Not affected rhelai3/bootc-gaudi-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Not affected rhelai3/bootc-rocm-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Not affected rhelai3/disk-image-cuda-rhel9 Red Hat Trusted Artifact Signer Not affected rhtas/rekor-search-ui-rhel9 streams for Apache Kafka 2 Affected next streams for Apache Kafka 3 Affected next https://www.cve.org/CVERecord?id=CVE-2026-64644 https://nvd.nist.gov/vuln/detail/CVE-2026-64644 https://github.com/vercel/next.js/commit/93cb90891402fa4c47798d03cb9e05c13233766c https://github.com/vercel/next.js/pull/96006 https://github.com/vercel/next.js/releases/tag/v15.5.21 https://github.com/vercel/next.js/releases/tag/v16.2.11 https://github.com/vercel/next.js/security/advisories/GHSA-q8wf-6r8g-63ch