ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-34078

Flatpak is a Linux application sandboxing and distribution framework.

Published Apr 7, 2026 · catalog updated Jul 24, 2026 · Flatpak is a Linux

Check if you run it

No confirmed exploitation is on record for CVE-2026-34078. EPSS is 0.90%. Act only if a listed version of Flatpak is a Linux is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Flatpak is a Linux).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.90%
Remediation
Advisory link
Affected products
cpe flatpak/flatpak

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe flatpak/flatpakversion unspecified

How to fix CVE-2026-34078

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-34078. EPSS is 0.90%. Act only if a listed version of Flatpak is a Linux is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-59: Link Following; CWE-61. EPSS 0.90%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 7, 2026 · NIST NVD

    Detected

    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 vulne

  2. Jul 24, 2026 · NIST NVD

    Updated

    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 vulne

Sources

  • CVE.orgVulnerability recordCVE-2026-34078

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-34078

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-2026-34078

    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 g

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.