GHSA-q8wf-6r8g-63ch: Next.js: Denial of Service in the Image Optimization API using SVGs

mediumCVE-2026-64644

Impact 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. - If you are using config.images.remotePatterns, only the patterns in that array are impacted. - If you are using config.images.unoptimized: true, you are NOT impacted. - If you are using config.images.loader: 'custom', you are NOT impacted. - If you are using Vercel, you are NOT impacted. Workarounds If you cannot upgrade immediately, you can avoid the expensive work by setting config.experimental.imgOptSkipMetadata : true.

Details

Source: GitHub Security Advisories (INTL · database · site)
Severity: medium
Published: 2026-07-22
Last updated: 2026-07-22
Exploitation: Not in CISA KEV at last sync

Original advisory: https://github.com/advisories/GHSA-q8wf-6r8g-63ch

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-646440.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64644	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

GHSA-q8wf-6r8g-63ch: Next.js: Denial of Service in the Image Optimization API using SVGs

Details

Exploitation outlook

Referenced CVEs

Same CVEs, other sources

More from GitHub Security Advisories