CVE-2026-64644
Next.js: Denial of Service in the Image Optimization API using SVGs
- State
- Published
- Severity
- 6.3 Medium
- Published
- Jul 27, 2026
- Updated
- Jul 27, 2026
- Reserved
- Jul 20, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-407 Inefficient Algorithmic Complexity
Affected Products
| Product | Versions |
|---|---|
next.jsvercel |
|
References
- https://github.com/vercel/next.js/security/advisories/GHSA-q8wf-6r8g-63ch
- https://github.com/vercel/next.js/pull/96006
- https://github.com/vercel/next.js/commit/93cb90891402fa4c47798d03cb9e05c13233766c
- https://github.com/vercel/next.js/releases/tag/v15.5.21
- https://github.com/vercel/next.js/releases/tag/v16.2.11
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