High [CVE-2026-18358] gnome-remote-desktop system-mode RDP server missing connection throttling allows unauthenticated denial of service
This high-severity Red Hat Linux advisory covers CVE-2026-18358 affecting Red Hat Enterprise Linux 10, Red Hat package: gnome-remote-desktop.
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Summary
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.
This vulnerability only affects deployments where gnome-remote-desktop is explicitly configured to run in system mode with the RDP port reachable from untrusted networks. The default user-session mode is not affected.
The Moderate rather than Important severity rating reflects that exploitation requires a non-default configuration (system-mode RDP must be explicitly enabled and the listener must be network-accessible), which significantly limits the practical attack surface. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-400. Affected Red Hat products: Red Hat Enterprise Linux 10.
Red Hat fixing advisory: RHSA-2026:54512.
Affected products named by the advisory: Red Hat package: gnome-remote-desktop.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
- gnome-remote-desktop-0:49.3-4.el10_2
- RHSA-2026:54512
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- If system-mode RDP is not required, disable it. If it must remain enabled, restrict the RDP listener (default port 3389) to trusted hosts or management networks using host-based firewall rules.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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