Node.js HTTP/2 use-after-free corrupts server memory (CVE-2026-123874)

high severity · published 2026-11-11

An unauthenticated remote client can corrupt the memory of your Node.js HTTP/2 server, over TLS or cleartext. This happens when the server serves a file with respondWithFile() or respondWithFD(), with default settings otherwise.

Fixed in: 26.13.1

CVE: CVE-2026-123874

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 2545 and your operating system.