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Date: Mon, 28 Sep 2026 14:02:44 +0100
From: Simon McVittie <smcv@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: flatpak: multiple vulnerabilities fixed in 1.18.4
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Source: flatpak
Severity: grave
Tags: security
Justification: user security hole
X-Debbugs-Cc: Debian Security Team <team@security.debian.org>

Flatpak 1.18.4 addresses multiple security vulnerabilities:

>* Prevent privileged overwrite of arbitrary files with an empty file or a
>  symlink to /run/host/monitor/resolv.conf when a malicious app is installed
>  (CVE-2026-97024, GHSA-8xgq-v545-vgvf; thanks to Sebastian Wick)
>
>* Prevent privileged deletion of arbitrary files when a malicious app
>  is installed
>  (CVE-2026-97023, GHSA-5p67-xh8x-rq54; thanks to Sebastian Wick)
>
>* When downloading apps or runtimes from an OCI repository that requires
>  authentication, don't make the authentication token visible to other users
>  (CVE-2026-97025, GHSA-7rvf-rqr3-43j4; thanks to AISLE in cooperation
>  with Red Hat)
>
>* Restrict permissions on temporary repository directories in
>  /var/tmp/flatpak-cache-*
>  (CVE-2026-97026, GHSA-r9w3-qx54-qvc8; thanks to AISLE in cooperation
>  with Red Hat)
>
>* Filter .desktop and D-Bus .service files against an allowlist of fields,
>  preventing denial of service and unintended interactions with host services
>  (CVE-2026-97027, GHSA-v64f-hrwr-j4vh; thanks to Markus Göllnitz)
>
>* Prevent apps from sending signals to a process group that includes a
>  parent process outside the app, causing denial of service by killing
>  the desktop environment
>  (CVE-2026-97029, GHSA-f3p8-vr7v-gxf2; thanks to Guthrie Armstrong,
>  Coalition, Inc.)

I intend to fix these as a batch, in both testing/unstable and stable, 
so reporting one bug for the whole batch.

    smcv
]