Flatpak up to 1.16.3 symlink

CVSS Meta Temp Score
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CTI Interest Score
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9.7$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Flatpak up to 1.16.3. Impacted is an unknown function. Such manipulation leads to symlink. This vulnerability is documented as CVE-2026-34078. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Flatpak up to 1.16.3. It has been rated as very critical. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a symlink vulnerability. Using CWE to declare the problem leads to CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-34078 since 03/25/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 306339 (Fedora 43 : flatpak (2026-5286084b44)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.16.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (306339) and CERT Bund (WID-SEC-2026-1732). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Oracle Linux
  • RESF Rocky Linux
  • Red Hat Enterprise Linux

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 10.0
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Symlink
CWE: CWE-61 / CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 306339
Nessus Name: Fedora 43 : flatpak (2026-5286084b44)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Flatpak 1.16.4

Timelineinfo

03/25/2026 CVE reserved
04/08/2026 +13 days Advisory disclosed
04/08/2026 +0 days VulDB entry created
07/02/2026 +85 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-34078 (🔒)
GCVE (CVE): GCVE-0-2026-34078
GCVE (VulDB): GCVE-100-355976
CERT Bund: WID-SEC-2026-1732 - Red Hat Enterprise Linux (Flatpak): Mehrere Schwachstellen

Entryinfo

Created: 04/08/2026 07:29
Updated: 07/02/2026 04:06
Changes: 04/08/2026 07:29 (65), 04/14/2026 16:26 (2), 05/31/2026 05:44 (7), 07/02/2026 04:06 (11)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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