High
xdg-dbus-proxy — security advisory
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.
- Products
- xdg-dbus-proxy
- Affected versions
- 0.1.1-1, 0.1.2-1, 0.1.2-1ubuntu0.1~esm1, 0.1.2-2build1, 0.1.3-1, 0.1.3-1ubuntu0.1, 0.1.5-1, 0.1.5-1build1, 0.1.5-1build2, 0.1.5-1ubuntu0.1, 0.1.5-1ubuntu0.2, 0.1.6-1, 0.1.6-2, 0.1.7-1, 0.1.8-1, 0.1.9-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-94422
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:33 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-94422
xdg-dbus-proxy
Fixed versions: Not specified
xdg-dbus-proxy
Fixed versions: Not specified
xdg-dbus-proxy
Fixed versions: Not specified
xdg-dbus-proxy
Fixed versions: Not specified
xdg-dbus-proxy
Fixed versions: Not specified
Complete source record
{
"id": "37b036d5fd286a6788085d1ccdb6dd173a0174be395253d7c7775139fc3b512b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-94422",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-94422",
"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.",
"evidence": "osv:UBUNTU-CVE-2026-94422",
"products": [
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.1.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.1.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.1.2-1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.1.2-2build1",
"evidence": "/affected/1/versions"
},
{
"value": "0.1.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.1.3-1ubuntu0.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.1.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.5-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.5-1build2",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.5-1ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.5-1ubuntu0.2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.1.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.1.8-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.1.9-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.1.6-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.1.6-2",
"evidence": "/affected/4/versions"
},
{
"value": "0.1.7-1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-94422",
"aliases": [
"UBUNTU-CVE-2026-94422"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V4",
"score": "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"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/ubuntu/xdg-dbus-proxy?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"0.1.1-1",
"0.1.2-1",
"0.1.2-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94422.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xdg-dbus-proxy",
"binary_version": "0.1.2-1ubuntu0.1~esm1"
},
{
"binary_name": "xdg-dbus-proxy-tests",
"binary_version": "0.1.2-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/ubuntu/xdg-dbus-proxy?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.1.2-2build1",
"0.1.3-1",
"0.1.3-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94422.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xdg-dbus-proxy",
"binary_version": "0.1.3-1ubuntu0.1"
},
{
"binary_name": "xdg-dbus-proxy-tests",
"binary_version": "0.1.3-1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/ubuntu/xdg-dbus-proxy?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.1.5-1",
"0.1.5-1build1",
"0.1.5-1build2",
"0.1.5-1ubuntu0.1",
"0.1.5-1ubuntu0.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94422.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xdg-dbus-proxy",
"binary_version": "0.1.5-1ubuntu0.2"
},
{
"binary_name": "xdg-dbus-proxy-tests",
"binary_version": "0.1.5-1ubuntu0.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/ubuntu/xdg-dbus-proxy?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.1.7-1",
"0.1.8-1",
"0.1.9-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94422.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xdg-dbus-proxy",
"binary_version": "0.1.9-1"
},
{
"binary_name": "xdg-dbus-proxy-tests",
"binary_version": "0.1.9-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/xdg-dbus-proxy?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.1.6-1",
"0.1.6-2",
"0.1.7-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94422.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xdg-dbus-proxy",
"binary_version": "0.1.7-1"
},
{
"binary_name": "xdg-dbus-proxy-tests",
"binary_version": "0.1.7-1"
}
]
}
}
],
"modified": "2026-10-17T13:01:18.907481216Z",
"provider": "osv",
"upstream": [
"CVE-2026-94422"
],
"references": [
"https://ubuntu.com/security/CVE-2026-94422",
"https://www.cve.org/CVERecord?id=CVE-2026-94422",
"https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq"
]
},
"related_cves": [
{
"value": "CVE-2026-94422",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361636,
"published_at": "2026-10-02T14:17:00+00:00"
}