Link following in Flatpak - CVE-2026-96807
Published: August 11, 2026 / Updated: September 28, 2026
Vulnerability identifier: #VU141408
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-96807
CWE-ID: CWE-59
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to write files with fixed names and fixed content outside of the sandbox.
The vulnerability exists due to improper link resolution in regenerate_ld_cache when handling a symlinked ~/.var/app/$appid/.ld.so path. A local user can replace ~/.var/app/$appid/.ld.so with a symlink to write files with fixed names and fixed content outside of the sandbox.
The filenames and file content are not attacker-controlled, which makes exploitation difficult.
Affected software
Flatpak
How to mitigate CVE-2026-96807
Install security update from vendor's website.
Flatpak - update to 1.18.1