CVE-2026-96280

EUVD-2026-88015
The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 49.59%
Debian logo
Debian Releases
Debian Product
Codename
flatpak
bookworm
vulnerable
bookworm (security)
vulnerable
forky
1.18.4-1
fixed
sid
1.18.4-1
fixed
trixie
1.16.6-1~deb13u2
fixed
trixie (security)
1.16.6-1~deb13u3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
flatpak
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
stonking
not-affected
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
flatpak
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
flatpak-devel
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
flatpak-remote-flathub
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
flatpak-zsh-completion
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
libflatpak0
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
system-user-flatpak
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
typelib-1_0-Flatpak-1_0
suse enterprise desktop 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise sap 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise sap 15 SP7
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP5
1.16.6-150500.3.21.1
fixed
suse enterprise server 15 SP6
1.16.6-150600.3.12.1
fixed
suse enterprise server 15 SP7
1.16.6-150600.3.12.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
flatpak
RHEL 8
0:1.12.9-7.el8_10
fixed
RHEL 8.4 AUS
0:1.12.9-2.el8_4.1
fixed
RHEL 8.6 AUS
0:1.12.9-1.el8_6.1
fixed
RHEL 8.8 E4S
0:1.12.9-1.el8_8.1
fixed
RHEL 8.8 TUS
0:1.12.9-1.el8_8.1
fixed
RHEL 9
0:1.12.9-6.el9_9.5
fixed
flatpak-devel
RHEL 8
0:1.12.9-7.el8_10
fixed
RHEL 9
0:1.12.9-6.el9_9.5
fixed
flatpak-libs
RHEL 8
0:1.12.9-7.el8_10
fixed
RHEL 8.4 AUS
0:1.12.9-2.el8_4.1
fixed
RHEL 8.6 AUS
0:1.12.9-1.el8_6.1
fixed
RHEL 8.8 E4S
0:1.12.9-1.el8_8.1
fixed
RHEL 8.8 TUS
0:1.12.9-1.el8_8.1
fixed
RHEL 9
0:1.12.9-6.el9_9.5
fixed
flatpak-selinux
RHEL 8
0:1.12.9-7.el8_10
fixed
RHEL 8.4 AUS
0:1.12.9-2.el8_4.1
fixed
RHEL 8.6 AUS
0:1.12.9-1.el8_6.1
fixed
RHEL 8.8 E4S
0:1.12.9-1.el8_8.1
fixed
RHEL 8.8 TUS
0:1.12.9-1.el8_8.1
fixed
RHEL 9
0:1.12.9-6.el9_9.5
fixed
flatpak-session-helper
RHEL 8
0:1.12.9-7.el8_10
fixed
RHEL 8.4 AUS
0:1.12.9-2.el8_4.1
fixed
RHEL 8.6 AUS
0:1.12.9-1.el8_6.1
fixed
RHEL 8.8 E4S
0:1.12.9-1.el8_8.1
fixed
RHEL 8.8 TUS
0:1.12.9-1.el8_8.1
fixed
RHEL 9
0:1.12.9-6.el9_9.5
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://access.redhat.com/errata/RHSA-2026:80497
https://access.redhat.com/errata/RHSA-2026:80498
https://access.redhat.com/errata/RHSA-2026:80687
https://access.redhat.com/errata/RHSA-2026:89733
https://access.redhat.com/errata/RHSA-2026:90364
https://access.redhat.com/errata/RHSA-2026:92221
https://access.redhat.com/errata/RHSA-2026:92369
https://access.redhat.com/errata/RHSA-2026:95493
https://access.redhat.com/errata/RHSA-2026:98112
https://access.redhat.com/errata/RHSA-2026:98127
https://access.redhat.com/errata/RHSA-2026:98490
https://access.redhat.com/errata/RHSA-2026:98595
https://access.redhat.com/errata/RHSA-2026:99010
https://access.redhat.com/security/cve/CVE-2026-96280
https://bugzilla.redhat.com/show_bug.cgi?id=2539419
https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc