# CVE-2026-18358: Denial of service in Red Hat Enterprise Linux 10

> Unauthenticated attackers can cause denial of service in GNOME Remote Desktop system-mode RDP by bypassing connection throttling, affecting Red Hat Enterprise Linux.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Jul 2026
- **Updated:** 20 Oct 2026
- **Also known as:** ALSA-2026:54512, DEBIAN-CVE-2026-18358, GHSA-5hp4-5mvq-qw3w, RHSA-2026:54512, RLSA-2026:54512, UBUNTU-CVE-2026-18358, openSUSE-SU-2026:21888-1

## What is CVE-2026-18358?

CVE-2026-18358 is a high-severity denial of service vulnerability in GNOME Red Hat Enterprise Linux 10, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-18358?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `gnome-remote-desktop` | AlmaLinux:10 | All versions | 49.3-4.el10_2 |
| `gnome-remote-desktop` | Red Hat:enterprise_linux:10.2 | All versions | 0:49.3-4.el10_2 |
| `gnome-remote-desktop-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:49.3-4.el10_2 |
| `gnome-remote-desktop-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:49.3-4.el10_2 |
| `gnome-remote-desktop` | Rocky Linux:10 | All versions | 0:49.3-4.el10_2 |
| `gnome-remote-desktop` | openSUSE:Leap 16.0 | All versions | 48.3-160000.3.1 |

## How do I fix CVE-2026-18358?

Apply the vendor's patch.

## Is CVE-2026-18358 being exploited?

There is no known exploitation of CVE-2026-18358 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-18358 and fix it if it is affected.

What it is: CVE-2026-18358 is a high-severity denial of service vulnerability in GNOME Red Hat Enterprise Linux 10, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-18358 in the wild and no public exploit code.

Affected product: GNOME Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-18358/ (Markdown: https://insights.sbomify.com/CVE-2026-18358/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18358
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18358
- OSV: https://osv.dev/vulnerability/CVE-2026-18358

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-18358/
Summaries are generated and may contain mistakes; the official description above is the record.