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.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4944-1 advisory.

    - CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and     write access       to files on the host (bsc#1280236).
    - CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).
    - CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).
    - CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).
    - CVE-2026-96280: buffer overflow in OCI delta stream path names (bsc#1282518).
    - CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes     (bsc#1282519).
    - CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).
    - CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so`     (bsc#1282523).
    - CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering       (bsc#1282524).

    Changes for flatpak:

    - Update to version 1.16.6 (jsc#PED-17048):
     + Fix file descriptor leaks affecting Chromium-based browsers.
     + Fix installing extra-data without a runtime, including openh264.
     + Fix unusable sandbox-expose paths affecting Epiphany.
     + Fix installed tests and handling of file descriptor arguments.
    - Changes from version 1.16.5:
     + Fix regressions from the sandbox escape security fix affecting      browsers, browser-based apps and Steam.
     + Expand test coverage of flatpak-run features used by the portal.
    - Changes from version 1.16.4:
     + Prevent arbitrary file reads in the system-helper context      (GHSA-2fxp-43j9-pwvc).
     + Prevent orphaning cross-user pull operations (GHSA-89xm-3m96-w3jg).
    - Changes from version 1.16.3:
     + Be selective about mapping font-dirs.xml in flatpak build.
    - Changes from version 1.16.2:
     + Support reinstalling bundle installations and Intel Xe VA-API.
     + Add cancellation support for curl downloads.
     + Fix font configuration, mask and pin configuration reloads,      unintended home directory access, flatpak kill, OCI support,      memory leaks and crashes.
    - Changes from version 1.16.1:
     + Allow updating existing apps under parental controls by default.
     + Use instance IDs for systemd scopes and include /dev/udmabuf      with --device=dri.
     + Speed up prune --dry-run and permission-reset.
     + Support TLS certificates in /etc/containers/certs.d for OCI.
     + Fix portal crashes, sandbox environment handling, accessibility      bus discovery, error reporting and shell completion.
     + Update documentation and translations.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4610-1 advisory.

    - CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and     write access       to files on the host (bsc#1280236).
    - CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).
    - CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).
    - CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).
    - CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes     (bsc#1282519).
    - CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).
    - CVE-2026-96283: flatpak-system-helper: cross-user `CancelPull` orphans another user's ongoing pull     (bsc#1282521).
    - CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so`     (bsc#1282523).
    - CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering       (bsc#1282524).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-96276)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
374780	SUSE SLED15: flatpak / flatpak-devel / flatpak-remote-flathub / etc (SUSE-SU-2026:4944-1)	Nessus	SuSE Local Security Checks	Local	high
369263	SUSE SLES12 Security Update : flatpak (SUSE-SU-2026:4610-1)	Nessus	SuSE Local Security Checks	Local	high
349337	Linux Distros Unpatched Vulnerability : CVE-2026-96276	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-96276

critical

Tenable Plugins

high

high

critical