Vulnerability-Lookup

RHSA-2026:54512

Vulnerability from csaf_redhat - Published: 2026-08-13 11:07 - Updated: 2026-08-14 06:01

Summary

Red Hat Security Advisory: gnome-remote-desktop security update

Severity

Moderate

Notes

Topic: An update for gnome-remote-desktop is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: GNOME Remote Desktop is a remote desktop and screen sharing service for the GNOME desktop environment. Security Fix(es): * gnome-remote-desktop: gnome-remote-desktop system-mode RDP server missing connection throttling allows unauthenticated denial of service (CVE-2026-18358) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-18358

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.

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-400 - Uncontrolled Resource Consumption

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:54512	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2462876	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-18358	self
https://bugzilla.redhat.com/show_bug.cgi?id=2462876	external
https://www.cve.org/CVERecord?id=CVE-2026-18358	external
https://nvd.nist.gov/vuln/detail/CVE-2026-18358	external

Acknowledgments

JSON

To clipboard

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  "vulnerabilities": [
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          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "gnome-remote-desktop: gnome-remote-desktop system-mode RDP server missing connection throttling allows unauthenticated denial of service",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "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.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.aarch64",
          "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.ppc64le",
          "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.s390x",
          "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.src",
          "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.x86_64",
          "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.aarch64",
          "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.ppc64le",
          "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.s390x",
          "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.x86_64",
          "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.aarch64",
          "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.ppc64le",
          "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.s390x",
          "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18358"
        },
        {
          "category": "external",
          "summary": "RHBZ#2462876",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462876"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18358",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-18358"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-18358",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18358"
        }
      ],
      "release_date": "2026-07-31T12:12:33.227000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-13T11:07:04+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.src",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.x86_64",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.x86_64",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:54512"
        },
        {
          "category": "workaround",
          "details": "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.",
          "product_ids": [
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.src",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.x86_64",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.x86_64",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.src",
            "AppStream-10.2.Z:gnome-remote-desktop-0:49.3-4.el10_2.x86_64",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-debuginfo-0:49.3-4.el10_2.x86_64",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.aarch64",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.ppc64le",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.s390x",
            "AppStream-10.2.Z:gnome-remote-desktop-debugsource-0:49.3-4.el10_2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "gnome-remote-desktop: gnome-remote-desktop system-mode RDP server missing connection throttling allows unauthenticated denial of service"
    }
  ]
}

CVE-2026-18358 (GCVE-0-2026-18358)

Vulnerability from cvelistv5 – Published: 2026-07-31 12:20 – Updated: 2026-08-13 11:07

Title

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

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-31 19:53 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

redhat

References

3 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:54512	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-18358	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2462876	issue-trackingx_refsource_REDHAT

Impacted products

4 products

Vendor	Product	Version
GNOME	gnome-remote-desktop
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:49.3-4.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-07-31 12:12

Credits

This issue was discovered by Found by AISLE in partnership with Red Hat.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

RHSA-2026:54512

CVE-2026-18358 (GCVE-0-2026-18358)

Tags

Sightings

Nomenclature