CVE-2026-97027

Summary

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Affected Software

Weaknesses

• CWE-20: Improper Input Validation

Workarounds

Only install applications from trusted sources.

References

• https://access.redhat.com/security/cve/CVE-2026-97027
• https://bugzilla.redhat.com/show_bug.cgi?id=2542683
• https://github.com/flatpak/flatpak/security/advisories/GHSA-v64f-hrwr-j4vh

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