CVE-2021-41133
flatpak: Sandbox bypass via recent VFS-manipulating syscalls
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 8, 2021
Updated · November 22, 2025
Description
A flaw was found in the flatpak package. It is susceptible to a software flaw that can deceive portals and other host-OS services into treating the flatpak app as an ordinary, non-sandboxed host-OS process. This flaw allows the escalation of privileges that the corresponding services presume the flatpak app has. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-20 · Improper Input Validation