Flatpak up to 1.18.0 Sandbox .ld.so regenerate_ld_cache appid symlink

Summaryinfo

A vulnerability marked as problematic has been reported in Flatpak up to 1.18.0. The affected element is the function regenerate_ld_cache of the file .ld.so of the component Sandbox. This manipulation of the argument appid causes symlink. This vulnerability appears as CVE-2026-96807. The attack requires local access. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Flatpak up to 1.18.0 and classified as problematic. Affected by this vulnerability is the function regenerate_ld_cache of the file .ld.so of the component Sandbox. The manipulation of the argument appid with an unknown input leads to a symlink vulnerability. The CWE definition for the vulnerability is CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. As an impact it is known to affect integrity, and availability. The summary by CVE is:

In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content are not attacker controlled, making this hard to exploit.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-96807 since 09/23/2026. The exploitation appears to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.18.1 eliminates this vulnerability.

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Productinfo

Name

• Flatpak

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18.0

Website

• Product: https://github.com/flatpak/flatpak/

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