CVE-2026-94422 | 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 i
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.
- 🔗 access.redhat.com/security/cve/CVE-2026-94422
- 🔗 github.com/flatpak/xdg-dbus-proxy/security/advisorie…
- 🔗 github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4db…
- 🔗 github.com/flatpak/xdg-dbus-proxy/commit/fc027f75931…
- 🔗 github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe9…
- 🔗 bugzilla.redhat.com/show_bug.cgi
- 🔗 www.openwall.com/lists/oss-security/2026/09/23/5
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CVE-2026-94422 | 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 i
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 maliciou
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