AIKIDO-2026-11042
nginx is vulnerable to Resource Exhaustion
75
High Risk
This Affects:
nginxTL;DR
nginx HTTP/2 request handling does not cap the number of request header fields independently from decoded header size. A client can use HPACK indexed references to send many tiny header fields cheaply, then stall the response stream so per-request allocations remain live. Pre-fix servers can suffer remote memory exhaustion and availability loss from a small number of HTTP/2 connections. The fix adds the max_headers directive with a default limit and rejects requests that exceed it.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and HTTP/2 is enabled.
Background info
nginx is vulnerable to Resource Exhaustion in versions 1.9.5 - 1.29.7.
How to fix this
Upgrade the nginx library to the patch version.
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