Vulnary
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Critical· 9.3official fix available

CVE-2026-34078

A flaw in the Flatpak sandboxing framework allows applications to bypass security boundaries. By using specially crafted links, an application can trick the system into granting access to files on the host computer that should remain protected.

publishedApr 7, 2026
last modifiedJul 24, 2026
sourcesNVD
severity · cvss
9.3
critical · how bad it is
exploitation · epss
2%
75th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 25, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Users running Flatpak versions prior to 1.16.4 on Linux systems.

02

Real-world impact

An attacker could use a malicious application to access all files on your computer, potentially leading to full control over your system.

03

Why this severity

This is a critical vulnerability because it allows an attacker to remotely access sensitive files on a host system without needing any special privileges or user interaction.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade Flatpak to version 1.16.4 or later.

NVD-referenced vendor advisory

05

Timeline

  1. Apr 7, 2026 · Apr 7, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 24, 2026 · 11d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 26, 2026 · 10d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Attack requirementsNone
Privileges requiredNone
User interactionNone needed
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →