CVE-2022-21721

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CVE-2022-21721

Summary: DOS Vulnerability in next.js

Details: Next.js is a React framework. Starting with version 12.0.0 and prior to version 12.0.9, vulnerable code could allow a bad actor to trigger a denial of service attack for anyone using i18n functionality. In order to be affected by this CVE, one must use next start or a custom server and the built-in i18n support. Deployments on Vercel, along with similar environments where invalid requests are filtered before reaching Next.js, are not affected. A patch has been released, `[email protected]`, that mitigates this issue. As a workaround, one may ensure `/${locale}/_next/` is blocked from reaching the Next.js instance until it becomes feasible to upgrade.

References: https://github.com/vercel/next.js/releases/tag/v12.0.9, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21721.json, https://github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5x, https://nvd.nist.gov/vuln/detail/CVE-2022-21721, https://github.com/vercel/next.js/pull/33503