Vulnerability-Lookup

RHSA-2026:90523

Vulnerability from csaf_opensuse - Published: 2026-10-27 00:46 - Updated: 2026-10-29 08:14

Summary

Red Hat Security Advisory: xdg-dbus-proxy security update

Severity

Important

Notes

Topic: An update for xdg-dbus-proxy is now available for Red Hat Enterprise Linux 10.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. 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: xdg-dbus-proxy is a filtering proxy for D-Bus connections. It was originally part of the flatpak project, but it has been broken out as a standalone module to facilitate using it in other contexts. Security Fix(es): * xdg-dbus-proxy: xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape (CVE-2026-94422) 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-2026-94422

8.8 (High)


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

CWE-290 - Authentication Bypass by Spoofing

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:90523	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2542235	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-94422	self
https://bugzilla.redhat.com/show_bug.cgi?id=2542235	external
https://www.cve.org/CVERecord?id=CVE-2026-94422	external
https://nvd.nist.gov/vuln/detail/CVE-2026-94422	external
https://github.com/flatpak/xdg-dbus-proxy/securit…	external

Acknowledgments

refi64

JSON

To clipboard

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          "name": "xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)",
          "product_id": "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x"
        },
        "product_reference": "xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x",
        "relates_to_product_reference": "AppStream-10.2.Z"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)",
          "product_id": "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64"
        },
        "product_reference": "xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64",
        "relates_to_product_reference": "AppStream-10.2.Z"
      }
    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "refi64"
          ],
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2026-94422",
      "cwe": {
        "id": "CWE-290",
        "name": "Authentication Bypass by Spoofing"
      },
      "discovery_date": "2026-09-23T13:57:20+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2542235"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an attacker to bypass the intended message filtering on the D-Bus session bus by setting a reply serial number on non-reply messages. A malicious or compromised Flatpak app could use this to achieve arbitrary code execution outside its sandbox.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xdg-dbus-proxy: xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat\u0027s CVSSv3.1 score has been calculated from the upstream-provided CVSSv4 vector (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N). The resulting CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H vector reflects a network-exploitable flaw with low attack complexity and no privileges required, but requiring a user (via a malicious/compromised Flatpak app) to interact with the D-Bus session bus. The proxy\u0027s failure to validate reply-serial numbers on non-reply messages allows a sandboxed app to bypass its message filter and reach otherwise-blocked D-Bus interfaces, resulting in a full loss of confidentiality, integrity, and availability of the host system outside the sandbox.",
          "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:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.aarch64",
          "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.ppc64le",
          "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.s390x",
          "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.src",
          "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.x86_64",
          "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.aarch64",
          "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.ppc64le",
          "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.s390x",
          "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.x86_64",
          "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.aarch64",
          "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.ppc64le",
          "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x",
          "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-94422"
        },
        {
          "category": "external",
          "summary": "RHBZ#2542235",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2542235"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-94422",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-94422"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-94422",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94422"
        },
        {
          "category": "external",
          "summary": "https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq",
          "url": "https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq"
        }
      ],
      "release_date": "2026-09-23T13:57:20+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-27T00:46:45+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:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.aarch64",
            "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.ppc64le",
            "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.s390x",
            "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.src",
            "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.x86_64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.aarch64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.ppc64le",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.s390x",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.x86_64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.aarch64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.ppc64le",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:90523"
        },
        {
          "category": "workaround",
          "details": "Avoid running untrusted Flatpak apps and avoid running untrusted apps via other frameworks that use xdg-dbus-proxy.",
          "product_ids": [
            "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.aarch64",
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            "AppStream-10.2.Z:xdg-dbus-proxy-0:0.1.5-4.el10_2.1.s390x",
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            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64"
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.aarch64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.ppc64le",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.s390x",
            "AppStream-10.2.Z:xdg-dbus-proxy-debuginfo-0:0.1.5-4.el10_2.1.x86_64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.aarch64",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.ppc64le",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.s390x",
            "AppStream-10.2.Z:xdg-dbus-proxy-debugsource-0:0.1.5-4.el10_2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "xdg-dbus-proxy: xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape"
    }
  ]
}

CVE-2026-94422 (GCVE-0-2026-94422)

Vulnerability from cvelistv5 – Published: 2026-10-02 13:54 – Updated: 2026-10-24 03:08

Title

xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape

Summary

An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an attacker to bypass the intended message filtering on the D-Bus session bus by setting a reply serial number on non-reply messages. A malicious or compromised Flatpak app could use this to achieve arbitrary code execution outside its sandbox. xdg-dbus-proxy was designed to be part of the sandbox boundary for Flatpak, but it is released as a separate project and is sometimes used by other app frameworks such as Firejail.

Severity

8.8 (High)


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

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-02 16:51 UTC

CWE

CWE-290 - Authentication Bypass by Spoofing

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1076 records in the last 180 days details

References

8 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-94422	vendor-advisory
https://github.com/flatpak/xdg-dbus-proxy/securit…	third-party-advisory
https://github.com/flatpak/xdg-dbus-proxy/commit/…	patch
https://github.com/flatpak/xdg-dbus-proxy/commit/…	patch
https://github.com/flatpak/xdg-dbus-proxy/commit/…	patch
https://bugzilla.redhat.com/show_bug.cgi?id=2542235	issue-tracking
http://www.openwall.com/lists/oss-security/2026/09/23/5
https://lists.debian.org/debian-lts-announce/2026…

Impacted products

4 products

Vendor	Product	Version
		Affected: 0 , < 0.1.9 (semver)
Fedora	Fedora	Affected: 0 , < 0.1.9 (semver)
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10

Date Public

2026-09-23 13:57

Credits

refi64

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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