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CVE-2026-34078

Flatpak vulnerability

10.0 CRITICALEPSS 0.90%
  1. Published7 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Flatpak≤ 1.16.3

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

and 7 more references

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Frequently asked

Is CVE-2026-34078 being actively exploited?

CVE-2026-34078 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.90%.

How severe is CVE-2026-34078?

CVE-2026-34078 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.90% probability of exploitation.

Which products are affected by CVE-2026-34078?

Affected products include Flatpak.

How do I fix CVE-2026-34078?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34078 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.