CVE-2026-34078
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
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.
INFO
Published Date :
April 7, 2026, 10:16 p.m.
Last Modified :
April 24, 2026, 5:50 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update Flatpak to 1.16.4 or a later version.
- Apply vendor-provided patches for Flatpak.
- Review sandbox configurations for exposed paths.
Public PoC/Exploit Available at Github
CVE-2026-34078 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34078.
| URL | Resource |
|---|---|
| https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg | Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/04/09/8 | Third Party Advisory Mailing List |
| http://www.openwall.com/lists/oss-security/2026/04/10/14 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34078 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34078
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
DSA and DLA for Debian last 14 days
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34078 vulnerability anywhere in the article.
-
Help Net Security
Tails 7.6.2 patches vulnerability that could expose saved files
The Tails Project released Tails v7.6.2, an emergency release of the popular open source secure portable operating system. What is Tails? Tails, which is based on Debian GNU/Linux, is aimed at users w ... Read more
-
The Hacker News
⚡ Weekly Recap: Fiber Optic Spying, Windows Rootkit, AI Vulnerability Hunting and More
Monday is back, and the weekend’s backlog of chaos is officially hitting the fan. We are tracking a critical zero-day that has been quietly living in your PDFs for months, plus some aggressive state-s ... Read more
-
Help Net Security
Week in review: Windows zero-day exploit leaked, Patch Tuesday forecast
Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Cloudflare moves up its post-quantum deadline as researchers narrow the path to Q-Day Cloudflare annou ... Read more
-
Daily CyberSecurity
Root Access at Risk: Critical Nix Sandbox Escape Overwrites Sensitive System Files
A severe security vulnerability has been identified in the Nix package manager, a tool celebrated by the Linux and Unix communities for making package management reliable and reproducible. Tracked as ... Read more
-
Daily CyberSecurity
Denial of Service Alert: React Server Components Vulnerability Causes CPU Spikes
React, the popular JavaScript library used by millions of developers for building user interfaces, has issued an urgent advisory regarding a denial of service (DoS) vulnerability. The flaw specificall ... Read more
-
Daily CyberSecurity
Sandbox Escape: Critical Flatpak Flaw Grants Full Host Access
Flatpak, the widely-used system for building, distributing, and running sandboxed desktop applications on Linux, has been hit by a critical security vulnerability. The flaw, tracked as CVE-2026-34078 ... Read more
-
Help Net Security
Flatpak 1.16.4 fixes sandbox escape and three other security flaws
Flatpak, a Linux application sandboxing and distribution framework, released version 1.16.4, patching four security vulnerabilities. The most severe fix addresses a complete sandbox escape that leads ... Read more
The following table lists the changes that have been made to the
CVE-2026-34078 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 24, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:* versions up to (including) 1.16.3 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/09/8 Types: Mailing List, Third Party Advisory Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/10/14 Types: Mailing List, Third Party Advisory Added Reference Type GitHub, Inc.: https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg Types: Vendor Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 11, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/10/14 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 09, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/09/8 -
New CVE Received by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-61 Added Reference https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg