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Vulnerability · Published Oct 8, 2026 · Assigned by redhat

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

Medium 6.1

In plain English

A medium-severity path traversal in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 91.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12flatpak-builderno fix listedDEBIAN-CVE-2026-107466
Debian:13flatpak-builderno fix listedDEBIAN-CVE-2026-107466
Debian:14flatpak-builder1.4.11-1DEBIAN-CVE-2026-107466
Ubuntu:22.04:LTSflatpak-builderno fix listedUBUNTU-CVE-2026-107466
Ubuntu:24.04:LTSflatpak-builderno fix listedUBUNTU-CVE-2026-107466
Ubuntu:26.04:LTSflatpak-builderno fix listedUBUNTU-CVE-2026-107466
Ubuntu:26.10flatpak-builderno fix listedUBUNTU-CVE-2026-107466

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

References