negativeSYS.SOURCE: The Hacker News• 2026-07-10T17:17:43+05:30

Unpatched XRING Vulnerability in XQUIC Enables Remote HTTP/3 Server Crashes

#http/3 #xquic #server security #denial of service #open source

An unpatched vulnerability in XQUIC's QPACK implementation allows remote clients to crash HTTP/3 servers using standard traffic, affecting systems like Tengine. No official patch or CVE has been released, with mitigations requiring configuration changes or disabling HTTP/3.

A single wrong variable on one line in XQUIC, Alibaba's QUIC and HTTP/3 library, lets any remote client crash the server with a short burst of completely legal traffic. There is no patch.

FoxIO researcher Sébastien Féry disclosed the flaw on July 8 and nicknamed it XRING. He says it needs no login and no malformed packets: about 260 bytes of ordinary QPACK traffic takes the server

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