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CVE-2026-34078

10.0 · CRITICAL

Flatpak is a Linux application sandboxing and distribution framework.

Published Apr 7, 2026CWE-61EPSS 0.90%

Overview

CVE-2026-34078 is a critical-severity vulnerability. It was published on April 7, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprgRefwww.openwall.com/lists/oss-security/2026/04/09/8Refwww.openwall.com/lists/oss-security/2026/04/10/14Refaccess.redhat.com/errata/RHSA-2026:21755Refaccess.redhat.com/errata/RHSA-2026:21756Refaccess.redhat.com/errata/RHSA-2026:21757Refaccess.redhat.com/errata/RHSA-2026:23417Refaccess.redhat.com/errata/RHSA-2026:23418Refaccess.redhat.com/errata/RHSA-2026:23419Refaccess.redhat.com/errata/RHSA-2026:23420

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34078?

CVE-2026-34078 is a critical-severity vulnerability. It was published on April 7, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-34078?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34078?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34078?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34078 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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