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 for submit@bugs.debian.org; Tue, 07 Apr 2026 21:36:42 +0000
Date: Tue, 7 Apr 2026 22:36:41 +0100
From: Simon McVittie <smcv@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: flatpak: CVE-2026-34079: Arbitrary file deletion on the host
 filesystem
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X-Debian-User: smcv
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Package: flatpak
Severity: important
Tags: security
X-Debbugs-Cc: Debian Security Team <team@security.debian.org>

Flatpak older than 1.16.4 has an issue in which the caching for
ld.so removes outdated cache files without properly checking that the
app-controlled path to the outdated cache is in the cache directory. A 
malicious or compromised Flatpak app could use this to delete arbitrary 
files on the host system, a denial of service vulnerability (denying 
availability).

I think we should fix this in the same batch as the much more serious 
CVE-2026-34078.

Thanks,
    smcv
]