ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:
* Inject arbitrary HTTP headers * Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:
// lib/dispatcher/client-h1.js:1121 if (upgrade) { header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n` }
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade nodejs-packaging-bundlerUpgrade nodejs-docsUpgrade nodejsUpgrade nodejs-nodemonUpgrade nodejs-full-i18nUpgrade nodejs-packagingUpgrade nodejs-develUpgrade nodejs-libsUpgrade v8-13.6-develUpgrade npm | Apr 16, 2026 | Apr 9, 2026 |
| Amazon_linux_2023 | — | Upgrade v8-13.6-develUpgrade nodejs22-libs-debuginfoUpgrade v8-11.3-develUpgrade nodejs22-full-i18nUpgrade nodejs24-npmUpgrade nodejs22-debuginfoUpgrade nodejs20-npmUpgrade nodejs24-develUpgrade nodejs24-docsUpgrade nodejs20-docsUpgrade nodejs22Upgrade nodejs20Upgrade nodejs22-docsUpgrade nodejs24-full-i18nUpgrade nodejs20-full-i18nUpgrade nodejs20-debuginfoUpgrade nodejs22-npmUpgrade nodejs20-develUpgrade nodejs20-debugsourceUpgrade nodejs22-libsUpgrade nodejs22-develUpgrade nodejs24-libsUpgrade v8-12.4-develUpgrade nodejs24-debuginfoUpgrade nodejs24-libs-debuginfoUpgrade nodejs22-debugsourceUpgrade nodejs20-libs-debuginfoUpgrade nodejs24Upgrade nodejs24-debugsourceUpgrade nodejs20-libs | Apr 7, 2026 | Mar 12, 2026 |
| Oracle_linux | — | Upgrade nodejs-nodemonUpgrade nodejs24-docsUpgrade nodejs-libsUpgrade nodejs-full-i18nUpgrade nodejs24-develUpgrade npmUpgrade nodejs24-npmUpgrade nodejs-packaging-bundlerUpgrade nodejs24Upgrade nodejs24-libsUpgrade nodejs24-full-i18nUpgrade v8-13.6-develUpgrade nodejs-packagingUpgrade nodejsUpgrade nodejs-docsUpgrade nodejs-devel | Apr 22, 2026 | Mar 12, 2026 |
| Redhat_linux | — | Upgrade nodejs-debugsourceUpgrade nodejs-debuginfoUpgrade nodejs-packaging-bundlerUpgrade nodejs24-debugsourceUpgrade nodejs24-debuginfoUpgrade nodejs24-full-i18nUpgrade nodejs-docsUpgrade nodejs-libs-debuginfoUpgrade nodejs-packagingUpgrade nodejs24Upgrade nodejs-nodemonUpgrade nodejs24-develUpgrade nodejs24-docsUpgrade nodejs-libsUpgrade nodejs-develUpgrade nodejs24-libsNo solution existsUpgrade nodejs-full-i18nUpgrade npmUpgrade nodejs24-npmUpgrade nodejsUpgrade nodejs24-libs-debuginfoUpgrade v8-13.6-devel | Apr 13, 2026 | Mar 12, 2026 |
| Rocky_linux | — | Upgrade nodejsUpgrade nodejs24-libsUpgrade nodejs-develUpgrade v8-13.6-develUpgrade nodejs24-develUpgrade nodejs-libsUpgrade nodejs24Upgrade nodejs24-libs-debuginfoUpgrade nodejs24-full-i18nUpgrade nodejs-libs-debuginfoUpgrade nodejs-full-i18nUpgrade nodejs24-debuginfoUpgrade nodejs-debuginfoUpgrade nodejs24-debugsourceUpgrade nodejs-debugsource | Apr 13, 2026 | Apr 10, 2026 |
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