Improper isolation or compartmentalization in Flatpak - CVE-2026-97029
Published: September 28, 2026
Vulnerability identifier: #VU152565
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-97029
CWE-ID: CWE-653
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper isolation or compartmentalization in Flatpak process ID namespace separation when a sandboxed app signals its current process group. A remote user can call kill(0, signal) or killpg(0, signal) to cause a denial of service.
Affected software
Flatpak
How to mitigate CVE-2026-97029
Install security update from vendor's website.
Flatpak - update to 1.18.4