CVE-2026-97026

NameCVE-2026-97026
DescriptionFlatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-6524-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
flatpak (PTS)bookworm, bookworm (security)1.14.10-1~deb12u2vulnerable
trixie1.16.6-1~deb13u2vulnerable
trixie (security)1.16.6-1~deb13u3fixed
forky, sid1.18.4-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
flatpaksourcetrixie1.16.6-1~deb13u3DSA-6524-1
flatpaksource(unstable)1.18.4-1

Notes

https://github.com/flatpak/flatpak/security/advisories/GHSA-r9w3-qx54-qvc8
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