SB2026040867 - Fedora 42 update for flatpak

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Main Vulnerability Database SB2026040867

SB2026040867 - Fedora 42 update for flatpak

Published: April 8, 2026

Security Bulletin ID SB2026040867
Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Improper access control (CVE-ID: CVE-2026-34078)

The vulnerability allows a remote attacker to execute code in the host context.

The vulnerability exists due to improper access control in the Flatpak portal and flatpak run when processing sandbox-expose options containing app-controlled symlinks. A remote attacker can supply a crafted path to gain access to arbitrary host files and execute code in the host context.

The issue enables sandbox escape from a Flatpak app to the host environment.


2) Path traversal (CVE-ID: CVE-2026-34079)

The vulnerability allows a local user to delete arbitrary files on the host filesystem.

The vulnerability exists due to improper path validation in ld.so cache file caching when removing outdated cache files. A local user can control the path to an outdated cache file to delete arbitrary files on the host filesystem.


Remediation

Install update from vendor's website.

References