CVE-2026-107466

Flatpak-builder: local file exfiltration via `file

Published Oct 8, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

If Flatpak packaging is not required on the system, remove the flatpak-builder package to eliminate exposure: # dnf remove flatpak-builder For development environments and continuous integration pipelines where flatpak-builder is necessary, apply the following operational controls: 1. Avoid processing build manifests from untrusted or unverified third-party sources. 2. Execute builds within isolated, ephemeral container or virtual machine environments where sensitive host files and credentials are not mounted or accessible. 3. Implement pre-build pipeline checks to reject manifests containing `file://` URI schemes in `type: file` or `type: archive` source definitions.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Flatpak-builder: local file exfiltration via `file
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-22
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 5, 2026, 3:55 PM
Reserved
Oct 8, 2026, 6:59 AM
Status
Awaiting Analysis
Published
Oct 8, 2026, 8:16 AM
Modified
Nov 5, 2026, 4:17 PM