CVE-2026-33128 h3 has a Server-Sent Events Injection via Unsanitized Newlines in Event Stream Fields

H3 is a minimal HTTP 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...

CVE-2026-33128 h3 has a Server-Sent Events Injection via Unsanitized Newlines in Event Stream Fields

H3 is a minimal HTTP 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...

CVE-2026-33128

CVE-2026-33128 (H3) is a vulnerability in the H3 HTTP framework where insufficient newline sanitization in SSE message formatting can be exploited to inject arbitrary SSE events. The issue affects versions prior to 1.15.6 and 2.0.0 through 2.0.1-rc.14, allowing an attacker who controls any part o...