CVE-2026-96282: Flatpak: flatpak: extension metadata path traversal file existence oracle

Severity: low (CVSS 3.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-27 · updated 2026-09-29
Weakness: CWE-59

Description

A malicious Flatpak extension can probe the host filesystem to determine what files and directories exist at arbitrary paths, and host directory listings can be disclosed to sandboxed applications using the extension. Additionally, unvalidated extension metadata can cause extension content to be mounted at unintended locations inside the sandbox.

Affected products

Red Hat Enterprise Linux 10: all versions
Red Hat Enterprise Linux 7: all versions
Red Hat Enterprise Linux 8: all versions
Red Hat Enterprise Linux 9: all versions

References

https://access.redhat.com/security/cve/CVE-2026-96282
https://bugzilla.redhat.com/show_bug.cgi?id=2539422
https://github.com/flatpak/flatpak/security/advisories/GHSA-w69g-9x8j-7p8f

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