Node.js HTTP/2 flaw lets any client crash the server (CVE-2026-123863)

high severity · published 2026-11-11

Any unauthenticated HTTP/2 client, over TLS or cleartext, can terminate the Node.js process entirely. A common pattern — a handler that responds before the request body ends — is enough to trigger the crash, causing denial of service.

Fixed in: 26.13.1

CVE: CVE-2026-123863

Source: NVD

Am I affected?

You are affected if the installed version is older than 26.13.1. Check the version you have and update to 26.13.1 or later. The fixed version is verified against a vendor or advisory source.

Get the fix

FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 2540 and your operating system.