CVE-2026-18358: Gnome-remote-desktop: gnome-remote-desktop system-mode rdp server missing connection throttling allows unauthenticated denial of service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-31 · updated 2026-10-21
Weakness: CWE-400

Description

A flaw was found in gnome-remote-desktop as shipped in Red Hat Enterprise Linux. When the daemon is running in system mode with RDP enabled, the incoming connection handler bypasses the connection throttler, allowing an unauthenticated remote attacker to open many parallel pre-authentication connections to the RDP listener. This can accumulate accepted sockets and pending routing-token operations until timeout, exhausting resources and preventing legitimate users from establishing RDP sessions. This issue does not affect the upstream version.

Affected products

Red Hat Enterprise Linux 10: all versions — fixed in 0:49.3-4.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:47.3-3.el10_0.1

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:49.3-4.el10_2; Red Hat Enterprise Linux 10.0 Extended Update Support 0:47.3-3.el10_0.1. Check the vendor advisory for mitigations.

References

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