CVE-2022-21721

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, `next@12.0.9`, 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.

• https://github.com/vercel/next.js/pull/33503Patch, Third Party Advisory
• https://github.com/vercel/next.js/releases/tag/v12.0.9Release Notes, Third Party Advisory
• https://github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5xThird Party Advisory
• https://github.com/vercel/next.js/pull/33503Patch, Third Party Advisory
• https://github.com/vercel/next.js/releases/tag/v12.0.9Release Notes, Third Party Advisory
• https://github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5xThird Party Advisory

Published

Jan 28, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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