CVE-2026-107466 Flatpak-builder: local file exfiltration via `file
Attackers can exfiltrate sensitive host files by crafting build manifests that bypass directory confinement checks in flatpak-builder.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-107466?
CVE-2026-107466 is a medium-severity path traversal vulnerability in Red Hat Enterprise Linux 10, published on 8 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A flaw was found in flatpak-builder. This vulnerability allows an attacker to cause information disclosure by convincing a user or continuous integration (CI) system to process a crafted build manifest. By specifying local file Uniform Resource Identifiers (URIs) within source download definitions, the builder bypasses directory confinement checks. As a result, sensitive host files accessible to the build process can be read and incorporated into the build artifacts.
Weakness: CWE-22
Which versions are affected by CVE-2026-107466?
How do I fix CVE-2026-107466?
Apply the vendor's patch.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-107466 being exploited?
There is no known exploitation of CVE-2026-107466 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107466, GHSA-m6mj-r236-h4v7, UBUNTU-CVE-2026-107466.