Critical9.0Vendor: HighRed Hat Linux

Critical [CVE-2026-34078] Arbitrary code execution via crafted symlinks in sandbox-expose options

This critical-severity Red Hat Linux advisory covers CVE-2026-34078 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

CVE-2026-34078 Published Apr 7, 2026

CVE-2026-34078

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Arbitrary code execution via crafted symlinks in sandbox-expose options. Red Hat rates this important (CVSS 9).

Weakness: CWE-59. Affected package(s): flatpak.

Resolved in Red Hat advisory RHSA-2026:21757 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 7 more.

Affected versions

flatpak-0:1.12.9-4.el8_10
flatpak-0:1.16.0-9.el10_2.1
flatpak-0:1.12.9-3.el7_9
flatpak-0:1.12.9-1.el8_6
flatpak-0:1.12.9-2.el8_4
flatpak-0:1.12.9-1.el8_8
flatpak-0:1.12.7-5.el9_2.1
flatpak-0:1.16.0-5.el10_0.2
flatpak-0:1.12.9-4.el9_8.1
flatpak-0:1.12.9-3.el9_4.1
flatpak-0:1.12.9-4.el9_6.1

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:21757

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:21757 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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