{"cve":"CVE-2021-39178","nvd":{"published":"2021-08-31T00:15:07.203","modified":"2026-06-17T04:03:15.377","status":"Modified","description":"Next.js is a React framework. Versions of Next.js between 10.0.0 and 11.0.0 contain a cross-site scripting vulnerability. In order for an instance to be affected by the vulnerability, the `next.config.js` file must have `images.domains` array assigned and the image host assigned in `images.domains` must allow user-provided SVG. If the `next.config.js` file has `images.loader` assigned to something other than default or the instance is deployed on Vercel, the instance is not affected by the vulnerability. The vulnerability is patched in Next.js version 11.1.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/vercel/next.js/releases/tag/v11.1.1","https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m","https://github.com/vercel/next.js/releases/tag/v11.1.1","https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m"],"products":["vercel:next.js"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-39178","score":0.01139,"percentile":0.66611,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9gr3-7897-pp7m","url":"https://osv.dev/vulnerability/GHSA-9gr3-7897-pp7m","summary":"XSS in Image Optimization API for Next.js","modified":"2026-07-08T06:27:32.575463730Z","packages":[{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=10.0.0 <11.1.1"],"fixed":["11.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}