CVE-2026-90616 Flatpak - Sandbox Escape & Arbitrary Code Execution

Flatpak < 1.18.1 contains a sandbox escape vulnerability caused by missing symlink protection in app data directories, letting malicious sandboxed apps gain arbitrary read/write and code execution on the host, exploit requires attacker-controlled symlinks.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Sandbox Escape
Impact
Remote Code Execution, File System Read, File System Write
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
12 September 2026
Updated
15 October 2026
Weakness
CWE-61

Vendor fix

Update to version 1.18.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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