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Fencer Intel
medium 5.7

CVE-2026-97029 json

Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group

published last mo. modified 6d ago also EUVD-2026-88627 , GHSA-f3p8-vr7v-gxf2

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository flatpak/flatpak. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
5.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

Flatpak's process ID namespace separation does not prevent a sandboxed app's kill(0, signal) or killpg(0, signal) calls from reaching processes outside the sandbox that share the same process group. A malicious or compromised Flatpak app can use this to cause denial of service by terminating processes outside its sandbox, such as the desktop shell.

Patch / fix

  • flatpak Debian 13 1.16.6-1~deb13u3
  • flatpak Debian 14 1.18.4-1

debian advisories DEBIAN-CVE-2026-97029

  • flatpak openSUSE Tumbleweed 1.18.4-1.1

opensuse advisories openSUSE-SU-2026:11918-1

Is CVE-2026-97029 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-97029 updated cvss 5.7

flatpak: flatpak: Sandboxed app can signal unsandboxed processes in the same process group

  • Red Hat Enterprise Linux 7 flatpak, flatpak-libs, flatpak-builder, flatpak 1.16.0-5.el10_0.2 Red Hat Enterprise Linux 8 flatpak, flatpak-libs, flatpak-selinux, flatpak-session-helper, flatpak 1.16.0-5.el10_0.2 Red Hat Enterprise Linux 9 flatpak, flatpak-libs, flatpak-selinux, flatpak-session-helper, flatpak 1.16.0-5.el10_0.2 Red Hat Enterprise Linux 10 flatpak 1.16.0-5.el10_0.2
    affected: workaround, no fix available “Run Flatpak apps in a new session (setsid flatpak run ... or setsid() in the parent) or a new process group (setpgid (0, 0) in the parent), or avoid running untrusted Flatpak apps.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-653 Improper Isolation or Compartmentalization

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of flatpak/flatpak published their own advisory on GitHub. Reviewed sources take precedence over it.