ECHO-6DFE-B27A-9111 Local MITM of client-side X11 forwarding via abstract UNIX socket pre-binding, scoped by upstream to Red Hat Enterprise Linux OpenSSH clients. The vulnerable abstract-socket-first behavior is introduced by Red Hat's downstream openssh-7.2p2-x11.patch, which Debian does not carry: in the Debian openssh sources connect_local_xsocket() only connects to the filesystem-path X socket, and no debian/patches entry touches this code, so the vulnerable code path is not present. Debian rates it undetermined.
10
| Source | Link |
|---|---|
| advisory | www.advisory.echohq.com/cve/CVE-2026-55655 |
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15 Sep 2026 03:33Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.15 - 6.1
EPSS0.00132
SSVC