Security Advisory

CVE-2026-33128

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-03-20 09:37:07

Last updated 2026-03-20 11:40:27

Assigner GitHub_M

State PUBLISHED

Description

H3 is a minimal H(TTP) framework. In versions prior to 1.15.6 and between 2.0.0 through 2.0.1-rc.14, createEventStream is vulnerable to Server-Sent Events (SSE) injection due to missing newline sanitization in formatEventStreamMessage() and formatEventStreamComment(). An attacker who controls any part of an SSE message field (id, event, data, or comment) can inject arbitrary SSE events to connected clients. This issue is fixed in versions 1.15.6 and 2.0.1-rc.15.

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