Node.js · Report #3833629

Re-entrant `nghttp2_session_mem_send()` during `nghttp2_session_mem_recv()` causes heap-use-after-free in Node.js HTTP/2

Validstatus

highseverity

17upvotes

28 Aug 2026disclosed

Summary

A flaw in Node.js HTTP/2 handling allows nghttp2_session_mem_send() to be called re-entrantly while nghttp2_session_mem_recv() is executing, resulting in a heap-use-after-free.

This vulnerability affects Node.js 26.x, 24.x, and 22.x.

How it was found

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This report was disclosed publicly on HackerOne and belongs to its author and the program. See the original