Security Advisory

CVE-2026-54340

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-16 23:29:50

Last updated 2026-07-17 18:06:19

Assigner GitHub_M

CVSS score 7.5

State PUBLISHED

Description

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd.

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