CVE-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 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 v3 10.0 CRITICAL

10.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	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	Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/04/10/14	Mailing List Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:21755
https://access.redhat.com/errata/RHSA-2026:21756
https://access.redhat.com/errata/RHSA-2026:21757
https://access.redhat.com/errata/RHSA-2026:23417
https://access.redhat.com/errata/RHSA-2026:23418
https://access.redhat.com/errata/RHSA-2026:23419
https://access.redhat.com/errata/RHSA-2026:23420
https://access.redhat.com/errata/RHSA-2026:25068
https://access.redhat.com/errata/RHSA-2026:25381
https://access.redhat.com/errata/RHSA-2026:30901
https://access.redhat.com/errata/RHSA-2026:35843
https://access.redhat.com/security/cve/CVE-2026-34078
https://bugzilla.redhat.com/show_bug.cgi?id=2456276
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34078.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-07 22:16

Updated : 2026-07-24 22:10

NVD link : CVE-2026-34078

Mitre link : CVE-2026-34078

CVE.ORG link : CVE-2026-34078

JSON object : View

Products Affected

flatpak

flatpak

CWE

CWE-61

UNIX Symbolic Link (Symlink) Following

CWE-59

Improper Link Resolution Before File Access ('Link Following')

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[{"lang": "en", "value": "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."}, {"lang": "es", "value": "Flatpak es un framework de distribuci\u00f3n y sandboxing de aplicaciones Linux. Antes de la versi\u00f3n 1.16.4, el portal de Flatpak acepta rutas en las opciones de sandbox-expose que pueden ser enlaces simb\u00f3licos controlados por la aplicaci\u00f3n que apuntan a rutas arbitrarias. Flatpak run monta la ruta de host resuelta en el sandbox. Esto da a las aplicaciones acceso a todos los archivos del host y puede usarse como una primitiva para obtener ejecuci\u00f3n de c\u00f3digo en el contexto del host. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.16.4."}], "lastModified": "2026-07-24T22:10:00.140", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0555624B-B2EE-4FA9-908C-CB7707FABD23", "versionEndIncluding": "1.16.3"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}