A flaw in Node.js HTTP Agent connection reuse can cause a client to accept as valid a response that was sent before the client has sent the request. This is an incomplete fix of CVE-2026-48931.
The guard that destroys idle keep-alive sockets when unexpected data arrives only runs when the event loop polls for I/O. If an unsolicited response has already reached the socket but has not been read yet when the socket is handed to a new request, for example because the event loop was busy with synchronous work, the guard is removed without seeing it and the data is parsed as the response to the new request.
This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade nodejs-currentUpgrade nodejs | Oct 28, 2026 | Oct 23, 2026 |
| Amazon_linux_2023 | — | Upgrade nodejs24-develUpgrade nodejs22-debugsourceUpgrade nodejs22-libsUpgrade nodejs24-libs-debuginfoUpgrade v8-12.4-develUpgrade nodejs22-develUpgrade nodejs24-full-i18nUpgrade nodejs24-docsUpgrade nodejs24-libsUpgrade nodejs22-npmUpgrade nodejs24-debuginfoUpgrade nodejs22-full-i18nUpgrade v8-13.6-develUpgrade nodejs22-libs-debuginfoUpgrade nodejs24Upgrade nodejs22-docsUpgrade nodejs22-debuginfoUpgrade nodejs22Upgrade nodejs24-debugsourceUpgrade nodejs24-npm | Oct 28, 2026 | Oct 23, 2026 |
| Nodejs | — | Upgrade Node.js to 22.23.4, 24.22.1 or 26.12.1 or later | Oct 28, 2026 | Oct 23, 2026 |
| Redhat_linux | — | No solution exists | Oct 27, 2026 | Oct 23, 2026 |
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