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TI-2026-76832 Aliases CVE-2026-92162

Path traversal in Flatpak lets local users create root-owned trees

Priority LOW 33CWE-22Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 4 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

Flatpak before 1.18.1 does not validate the arch parameter in the DeployAppstream function (CWE-22). A local user in an active session can use a crafted architecture name to make flatpak-system-helper create root-owned directories outside the intended root directory, but only when at least one OCI remote is configured. Combined with other flaws fixed in 1.18.1, this can lead to local root privilege escalation.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Prior to version 1.18.1, on systems where at least one OCI remote is configured (most common on Fedora systems), a malicious local user in an active local session could use a crafted architecture name to trick the `flatpak-system-helper` process into creating a root-owned directory tree with contents determined by the OCI remote, plus a root-owned `lock` file and `icons` directory, outside the intended root directory. If this vulnerability is combined with other vulnerabilities also fixed in 1.18.1, the combination can lead to local root privilege escalation. This particular vulnerability is not believed to be exploitable if there are no OCI remotes configured (common on non-Fedora systems). Version 1.18.1 patches the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00233 14th percentileScored 2026-11-07
Fix Partial flatpak (flatpak): 1.18.1Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
flatpakflatpakbefore 1.18.11.18.1Patch availableCNA
  • flatpak Vendorflatpak Affected before 1.18.1 Fixed in 1.18.1 Patch available CNA

Remediation

Update Flatpak to version 1.18.1, which patches the issue. Red Hat rates this Important and lists Red Hat Enterprise Linux 7, 8, 9 and 10 as affected, with no fix plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

  • Fix · CNA flatpak (flatpak) Fixed in 1.18.1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-92162
  2. 2026-11-02 Affected versions changed · Red Hat
  3. 2026-11-02 CVSS score added · Red Hat

References

Other 5

  • TI-2026-28833 flatpak-builder has a path traversal leading to arbitrary file read on host when installing licence files CVSS 4.0HIGH 7.1
  • TI-2026-26401 Flatpak has a complete sandbox escape leading to host file access and code execution in the host context CVSS 4.0CRITICAL 9.3
  • TI-2024-28440 Flatpak may allow access to files outside sandbox for certain apps CVSS 3.1CRITICAL 10.0
  • TI-2023-12679 TIOCLINUX can send commands outside sandbox if running on a virtual console CVSS 3.1CRITICAL 10.0
  • TI-2026-79756 Path traversal in XDG Desktop Portal allows arbitrary file access CVSS 4.0HIGH 8.8
  • TI-2026-26402 Flatpak affected by arbitrary file deletion on the host filesystem CVSS 4.0HIGH 8.7
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences