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CVE-2026-96280

Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Enterprise Linux Eus and 6 more
CVE-2026-96275

Flatpak: flatpak: arbitrary write access as root via extra-data extraction

A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Enterprise Linux Eus and 6 more
CVE-2026-97024

Flatpak: flatpak: arbitrary write in root context via path traversal in deploy directory files/etc

A path traversal vulnerability in Flatpak's handling of the files/etc directory during app deployment allows a malicious Flatpak app to cause certain host system files (such as passwd, group, machine-id, or resolv.conf) to be emptied or replaced with a symlink when the app is installed or upgraded. In system-wide installations, the write is performed as root.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Enterprise Linux Eus and 3 more
CVE-2026-97023

Flatpak: flatpak: arbitrary file deletion in root context via path traversal in deploy directory export/bin

A path traversal vulnerability in Flatpak's handling of the export/bin directory during app deployment allows a malicious Flatpak app to cause deletion of attacker-chosen files outside the deployment directory when the app is installed or upgraded. In system-wide installations, the deletion is performed as root.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Enterprise Linux Eus and 3 more
CVE-2026-97027

Flatpak: flatpak: denial of service via unsanitized keys in exported desktop entry / d-bus service files

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

CVSS 3.1 · 3.6 Low EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-97026

Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path

Flatpak 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.

CVSS 3.1 · 3.9 Low EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-97025

Flatpak: flatpak: world-readable oci authentication token in system-helper cache path

Flatpak writes the OCI repository authentication token with world-readable permissions (0644) in the system-helper's cache directory, allowing other local users on a multi-user system to read the token and impersonate the authenticated user against the OCI repository. Only OCI-based sources (e.g. as used by Fedora) are affected; libostree-based sources such as Flathub are not.

CVSS 3.1 · 3.2 Low EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-96284

Flatpak: flatpak: arbitrary read-access to files in the system-helper context via oci symlink following

A malicious user can get read-access to files in the flatpak-system-helper context if a system OCI repository is configured, because the OCI code paths in the system helper follow symlinks when importing OCI images that are under the user's control.

CVSS 3.1 · 2.5 Low EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-96283

Flatpak: flatpak: flatpak-system-helper cross-user cancelpull orphans another user's ongoing pull

By calling org.freedesktop.Flatpak.SystemHelper.CancelPull on another user's pull, the pull is not actually cancelled but removed from internal tracking, making it impossible for the owning user to stop it. Ongoing pulls cannot be stopped.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-96282

Flatpak: flatpak: extension metadata path traversal file existence oracle

A malicious Flatpak extension can probe the host filesystem to determine what files and directories exist at arbitrary paths, and host directory listings can be disclosed to sandboxed applications using the extension. Additionally, unvalidated extension metadata can cause extension content to be mounted at unintended locations inside the sandbox.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-97029

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

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.

CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-96281

Flatpak: flatpak: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes

On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could use this to expose other users of the same system to an app version with unfixed vulnerabilities.

CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-96279

Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks

A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-96276

Flatpak: flatpak: arbitrary write in host context via flatpak build-init

If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows `..` traversal.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Flatpak Enterprise Linux Rhel Els
CVE-2026-55888

XDG Desktop Portal: Arbitrary file access via SaveFiles "files" option path traversal

XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileChooser.SaveFiles method to gain arbitrary file access to non-existing files on the host (limited to files the user has access to). The FileChooser.SaveFiles method takes optional filenames which get appended to the selected directory by backends. The backends are supposed to check that the file does not exist yet. The filenames are not validated by the frontend and also not by common backends. This issue has been patched in version 1.22.1.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Flatpak
Products
Xdg-desktop-portal
CVE-2026-39977

flatpak-builder has a path traversal leading to arbitrary file read on host when installing licence files

flatpak-builder is a tool to build flatpaks from source. From 1.4.5 to before 1.4.8, the license-files manifest key takes an array of paths to user defined licence files relative to the source directory of the module. The paths from that array are resolved using g_file_resolve_relative_path() and validated to stay inside the source directory using two checks - g_file_get_relative_path() which does not resolve symlinks and g_file_query_file_type() with G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS which only applies to the final path component. The copy operation runs on host. This can be exploited by using a crafted manifest and/or source to read arbitrary files from the host and capture them into the build output. This vulnerability is fixed in 1.4.8.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Flatpak
Products
Flatpak-builder
CVE-2026-94422

xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape

An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an attacker to bypass the intended message filtering on the D-Bus session bus by setting a reply serial number on non-reply messages. A malicious or compromised Flatpak app could use this to achieve arbitrary code execution outside its sandbox. xdg-dbus-proxy was designed to be part of the sandbox boundary for Flatpak, but it is released as a separate project and is sometimes used by other app frameworks such as Firejail.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Flatpak Redhat
Products
Xdg-dbus-proxy Enterprise Linux
CVE-2026-55889

XDG Desktop Portal: Drag-and-drop and copy-paste theft via predictable FileTransfer key

XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileTransfer.RetrieveFiles method to redirect drag-and-drop and copy-paste data targeted at other applications to itself. Some portals generate tokens which provide access to resources. The sharing of the token transfers access to the resource and is supposed to happen out of band. The tokens were generated with g_random_int or g_uuid_string_random, both of which use GLib's GRand based on the Mersenne Twister PRNG which created a stream of reproducible random numbers. By generating enough tokens, the state of the GRand can be recover and with it, the next tokens can be predictedinsufin. This issue has been patched in version 1.22.1.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Flatpak
Products
Xdg-desktop-portal
CVE-2026-92162

Flatpak vulnerable to path traversal via unvalidated "arch" parameter in DeployAppstream

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Prior to version 1.18.1, on systems where at least one OCI remote is configured (most common on Fedora systems), a malicious local user in an active local session could use a crafted architecture name to trick the `flatpak-system-helper` process into creating a root-owned directory tree with contents determined by the OCI remote, plus a root-owned `lock` file and `icons` directory, outside the intended root directory. If this vulnerability is combined with other vulnerabilities also fixed in 1.18.1, the combination can lead to local root privilege escalation. This particular vulnerability is not believed to be exploitable if there are no OCI remotes configured (common on non-Fedora systems). Version 1.18.1 patches the issue.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Flatpak
Products
Flatpak
CVE-2026-96807

flatpak: Flatpak: Low integrity or availability impact via symlink manipulation

In Flatpak before 1.18.1, a malicious sandboxed app can replace ~/.var/app/$appid/.ld.so with a symlink, causing regenerate_ld_cache to write files at an arbitrary location. The filenames and content are not attacker controlled, making this hard to exploit.

CVSS 3.1 · 4 Medium EPSS < 1% KEV · Not listed
Vendors
Flatpak
Products
Flatpak