Input validation error in Flatpak - CVE-2026-97027

Vulnerability identifier: #VU152571

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-97027

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper validation of exported vendor-extension keys in Flatpak's Desktop Entry and D-Bus Service file export handling when exporting application metadata. A local user can include arbitrary keys in exported Desktop Entry or D-Bus Service files to cause a denial of service.

Flatpak
Debian Linux
Anolis OS
flatpak
flatpak-devel
flatpak-libs
flatpak-session-helper
flatpak-tests
flatpak-doc
flatpak-selinux
flatpak (Debian package)

Install security update from vendor's website.

Flatpak - update to 1.18.4
flatpak - update to 1.18.4-1
flatpak-devel - update to 1.18.4-1
flatpak-libs - update to 1.18.4-1
flatpak-session-helper - update to 1.18.4-1
flatpak-tests - update to 1.18.4-1
flatpak-doc - update to 1.18.4-1
flatpak-selinux - update to 1.18.4-1
flatpak (Debian package) - update to 1.16.6-1~deb13u3

• https://github.com/flatpak/flatpak/security/advisories/GHSA-v64f-hrwr-j4vh
• https://github.com/flatpak/flatpak/commit/33931025ff74f4db7b09f0ad331e76f9fd9ab99e

• Multiple vulnerabilities in Flatpak
• Anolis OS update for flatpak
• Debian update for flatpak