# CVE-2026-107466: Flatpak-builder: local file exfiltration via `file

Status: published. Published: 2026-10-08. Updated: 2026-11-05.

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

- 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. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (flatpak-builder): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (flatpak-builder): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (flatpak-builder): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N; source: CNA: redhat

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.19% as of 2026-11-05; percentile 8.89%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-22

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-107466 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2471600 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-107466 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2471600 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-107466; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107466; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-107466; retrieved 2026-11-05; source updated Not reported

Revision: 5450cb43c15e65304150f72a28c52f901434ccc38d6e931eae5e520b64f77c4c

Canonical: https://y2.dev/cve/CVE-2026-107466

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