A flaw was found in the SFTP backend in gvfs. When mounting a share and reading a file, a malicious SFTP server can cause read_reply() to process a length that exceeds the size requested by the client. The function does not verify the server-provided length against the allocated buffer size, causing the operation to write past the intended boundaries. This issue allows a malicious server to corrupt adjacent heap memory in the gvfsd-sftp process, resulting in a denial of service as the process aborts upon detecting the heap corruption or potentially allowing arbitrary code execution.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4238-1 advisory.

    - CVE-2026-84267: `read_string()` allocates buffers withouth verifying that the buffer is completely     filled when       communicating with a malicious SFTP server, which can lead to uninitialized heap memory leaks     (bsc#1278157).
    - CVE-2026-84268: `read_reply()` processes length that exceeds requested client size when communicating     with a malicious       SFTP server, which can lead to an OOB write (bsc#1278158).
    - CVE-2026-84269: DSI read path processes length that exceeds requested client size when communicating     with a malicious       AFP server, which can lead to an OOB memory access (bsc#1278159).
    - CVE-2026-84270: `do_read()` trusts the data length returned by a mounted MTP device and does not limit     it to the       original size requested by the client, which can lead to an OOB write (bsc#1278156).

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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4240-1 advisory.

    - CVE-2026-84267: `read_string()` allocates buffers withouth verifying that the buffer is completely     filled when       communicating with a malicious SFTP server, which can lead to uninitialized heap memory leaks     (bsc#1278157).
    - CVE-2026-84268: `read_reply()` processes length that exceeds requested client size when communicating     with a malicious       SFTP server, which can lead to an OOB write (bsc#1278158).
    - CVE-2026-84269: DSI read path processes length that exceeds requested client size when communicating     with a malicious       AFP server, which can lead to an OOB memory access (bsc#1278159).
    - CVE-2026-84270: `do_read()` trusts the data length returned by a mounted MTP device and does not limit     it to the       original size requested by the client, which can lead to an OOB write (bsc#1278156).

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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-109801 advisory.

    A flaw was found in the SFTP backend in gvfs. When mounting a share and reading a file, a malicious SFTP     server can cause read_reply() to process a length that exceeds the size requested by the client. The     function does not verify the server-provided length against the allocated buffer size, causing the     operation to write past the intended boundaries. This issue allows a malicious server to corrupt adjacent     heap memory in the gvfsd-sftp process, resulting in a denial of service as the process aborts upon     detecting the heap corruption or potentially allowing arbitrary code execution.

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

Note that Nessus has not tested for this issue 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-2026:4200-1 advisory.

    - CVE-2026-84267: `read_string()` allocates buffers withouth verifying that the buffer is completely     filled when       communicating with a malicious SFTP server, which can lead to uninitialized heap memory leaks     (bsc#1278157).
    - CVE-2026-84268: `read_reply()` processes length that exceeds requested client size when communicating     with a malicious       SFTP server, which can lead to an OOB write (bsc#1278158).
    - CVE-2026-84269: DSI read path processes length that exceeds requested client size when communicating     with a malicious       AFP server, which can lead to an OOB memory access (bsc#1278159).
    - CVE-2026-84270: `do_read()` trusts the data length returned by a mounted MTP device and does not limit     it to the       original size requested by the client, which can lead to an OOB write (bsc#1278156).

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 Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-571b7e1505 advisory.

    Fix CVE-2026-84267, CVE-2026-84268, CVE-2026-84269, and CVE-2026-84270

Tenable has extracted the preceding description block directly from the Fedora 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.

  - A flaw was found in the SFTP backend in gvfs. When mounting a share and reading a file, a malicious SFTP     server can cause read_reply() to process a length that exceeds the size requested by the client. The     function does not verify the server-provided length against the allocated buffer size, causing the     operation to write past the intended boundaries. This issue allows a malicious server to corrupt adjacent     heap memory in the gvfsd-sftp process, resulting in a denial of service as the process aborts upon     detecting the heap corruption or potentially allowing arbitrary code execution. (CVE-2026-84268)

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

ID	Name	Product	Family	Type	Severity
347908	SUSE SLES15: gvfs / gvfs-backend-afc / gvfs-backend-samba / gvfs-backends / etc (SUSE-SU-2026:4238-1)	Nessus	SuSE Local Security Checks	Local	high
347904	SUSE SLED15: gvfs / gvfs-backend-afc / gvfs-backend-samba / gvfs-backends / etc (SUSE-SU-2026:4240-1)	Nessus	SuSE Local Security Checks	Local	high
347037	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: gvfs (UTSA-2026-109801)	Nessus	Unity Linux Local Security Checks	Local	high
346798	SUSE SLES12: gvfs / gvfs-backend-samba / gvfs-backends / gvfs-devel / gvfs-fuse / etc (SUSE-SU-2026:4200-1)	Nessus	SuSE Local Security Checks	Local	high
342551	Fedora 43 : gvfs (2026-571b7e1505)	Nessus	Fedora Local Security Checks	Local	high
342197	Linux Distros Unpatched Vulnerability : CVE-2026-84268	Nessus	Misc.	Local	high

Detections

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CVE-2026-84268

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Tenable Plugins

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