CVE-2026-44452

CVE-2026-44452 · h2o is vulnerable to heap overrun

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h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.

CVSS 5.9 · Средний · EPSS 0,4%

Опубликовано

2026-07-16T22:54:42.914Z

Обновлено

2026-07-17T14:03:52.757Z

Стек: system

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