CVE-2026-97023 in Red Hat
Summary
by MITRE • 09/28/2026
A path traversal vulnerability in Flatpak's handling of the export/bin directory during app deployment allows a malicious Flatpak app to cause deletion of attacker-chosen files outside the deployment directory when the app is installed or upgraded. In system-wide installations, the deletion is performed as root.
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Analysis
by VulDB Data Team • 09/28/2026
The identified flaw represents a critical path traversal vulnerability within the Flatpak runtime environment, specifically targeting the logic used during application deployment and upgrade processes involving the export bin directory. This security weakness stems from insufficient validation of file paths provided by malicious or compromised applications, allowing an attacker to manipulate relative path components such as dot-dot sequences to escape the intended sandboxed deployment scope. By exploiting this lack of strict boundary enforcement, a malicious Flatpak app can direct system operations to write or delete files located in arbitrary directories on the host filesystem rather than being confined to its designated installation prefix. This behavior fundamentally breaks the isolation guarantees that are central to containerized application architectures like Flatpak, effectively turning a sandboxed environment into one with unrestricted file system access depending on the context of execution.
The operational impact of this vulnerability is severe due to the privilege escalation inherent in how Flatpak handles system-wide installations. When an affected application is installed or upgraded under a system-wide configuration, the deployment process executes with root privileges to ensure proper permissions and accessibility for all users on the machine. Consequently, the path traversal attack does not merely affect the user's local data but allows for the deletion of critical system files as the superuser. This capability enables an attacker to perform destructive actions such as removing essential binaries, configuration files, or security-critical components that are necessary for the stable operation of the operating system. The ability to delete arbitrary files with root privileges can lead to complete denial of service, system instability, and potentially create conditions where further exploitation vectors become accessible by disabling security controls or integrity checks.
From a classification perspective, this vulnerability aligns closely with CWE-22 Improper Limitation of a Pathname to a Restricted Directory, as the core issue is the failure to restrict file operations within an expected directory structure. Furthermore, it relates to CWE-78 OS Command Injection if the path traversal leads to command execution via symlinks or similar mechanisms, though the primary impact described here is destructive file deletion. In terms of adversary tactics, this aligns with MITRE ATT&CK techniques involving T1083 File and Directory Discovery for reconnaissance prior to destruction, and more critically T1485 Data Destruction which describes the intentional erasure of data or information on a target system. The exploitation chain typically involves crafting a malicious application package that includes specially crafted metadata or file structures designed to trigger the path traversal during the automated deployment phase, leveraging trust in the installation process itself.
Mitigation strategies must focus on enforcing strict canonicalization and validation of all file paths before they are processed by the deployment engine. Developers should ensure that any user-supplied input representing a file location is resolved to its absolute form and verified against an allowlist of permitted directories using robust path resolution libraries rather than simple string manipulation. Additionally, implementing principle of least privilege during installation processes can reduce risk; for instance, performing non-privileged operations in unprivileged contexts and only elevating permissions when absolutely necessary with strict scope limitations. For end-users, the immediate recommendation is to update Flatpak to a patched version that addresses this specific logic error. Administrators should also audit their system-wide installations and consider restricting which applications are permitted to install at the system level until patches are applied, thereby limiting the attack surface available to potential threat actors seeking to compromise system integrity through application deployment mechanisms.