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
- 0.1.4-3, 0.1.4-3+deb12u1, 0.1.6-1, 0.1.6-1+deb13u1, 0.1.6-1+deb13u2, 0.1.6-2, 0.1.7-1, 0.1.8-1
- Fixed versions
- 0.1.4-3+deb12u2, 0.1.6-1+deb13u3, 0.1.9-1
- CVEs
- CVE-2026-94422
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:06 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:DEBIAN-CVE-2026-94422
xdg-dbus-proxy
Fixed versions: 0.1.4-3+deb12u2
xdg-dbus-proxy
Fixed versions: 0.1.6-1+deb13u3
xdg-dbus-proxy
Fixed versions: 0.1.9-1
Complete source record
{
"id": "21863be3d99204a184208c67a411315507207f3e4f69d058e96ea5ec26976460",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-94422",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-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:DEBIAN-CVE-2026-94422",
"products": [
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.1.4-3+deb12u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "0.1.4-3",
"evidence": "/affected/0/versions"
},
{
"value": "0.1.4-3+deb12u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.1.6-1+deb13u3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "0.1.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.1.6-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "0.1.6-1+deb13u2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "xdg-dbus-proxy",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.1.9-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "0.1.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.6-2",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.7-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.1.8-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-94422",
"aliases": [
"DEBIAN-CVE-2026-94422"
],
"metrics": [
{
"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.4-3+deb12u2"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/debian/xdg-dbus-proxy?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.1.4-3",
"0.1.4-3+deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-94422.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.6-1+deb13u3"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/debian/xdg-dbus-proxy?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.1.6-1",
"0.1.6-1+deb13u1",
"0.1.6-1+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-94422.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.9-1"
}
]
}
],
"package": {
"name": "xdg-dbus-proxy",
"purl": "pkg:deb/debian/xdg-dbus-proxy?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.1.6-1",
"0.1.6-2",
"0.1.7-1",
"0.1.8-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-94422.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-24T09:47:29.943998281Z",
"provider": "osv",
"upstream": [
"CVE-2026-94422"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-94422"
]
},
"related_cves": [
{
"value": "CVE-2026-94422",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 428987,
"published_at": "2026-10-02T14:17:12.003+00:00"
}