Medium · CVSS 6.1CVE-2026-107466

Flatpak-builder: local file exfiltration via `fileCVE-2026-107466

Answer in brief

CVE-2026-107466 records a Medium severity (CVSS 6.1) vulnerability in Flatpak-builder: local file exfiltration via `file. The current sources do not mark it as known exploited. The current feed maps Red Hat/flatpak-builder (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 8, 2026Updated Oct 8, 2026Source checked Oct 8, 2026First seen by HOL Oct 8, 2026Material review Oct 8, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/flatpak-builder (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/flatpak-buildergeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/flatpak-builder.
Review the reported fix. Source-reported 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.

Evidence timeline and material changes

Published upstream
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 8, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.