The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-0e46c91ccf advisory.

    New upstream security release


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 remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-063caa9112 advisory.

    New upstream security release (#2503148)


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 libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as     process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree,     leading to local denial of service. (CVE-2026-59845)

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

The version of libssh installed on the remote host is prior to 0.11.5 / 0.12.1. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-202-01 advisory.

    New libssh packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libssh 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 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3302-1 advisory.

    This update for libssh fixes the following issues

    - CVE-2026-3731: denial of service via out-of-bounds read in SFTP extension name handler (bsc#1259377).
    - CVE-2026-59843: denial of service via zero advertised channel packet size (bsc#1272164).
    - CVE-2026-59844: denial of service via oversized SFTP read length (bsc#1272165).
    - CVE-2026-59845: denial of service via unchecked ProxyCommand fork() failure (bsc#1272166).
    - CVE-2026-59846: information disclosure via ProxyCommand %r username expansion (bsc#1272167).
    - CVE-2026-59847: integrity downgrade via OpenSSL AES-GCM tag verification (bsc#1272168).
    - CVE-2026-59848: denial of service via SFTP responses with unknown request IDs (bsc#1272169).
    - CVE-2026-59850: use-after-free via data callbacks on closed channels (bsc#1272171).

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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21444-1 advisory.

    - CVE-2026-15370: stack buffer overflow in SFTP server longname construction (bsc#1272162).
    - CVE-2026-59843: denial of service via zero advertised channel packet size (bsc#1272164).
    - CVE-2026-59844: denial of service via oversized SFTP read length (bsc#1272165).
    - CVE-2026-59845: denial of service via unchecked ProxyCommand fork() failure (bsc#1272166).
    - CVE-2026-59846: information disclosure via ProxyCommand %r username expansion (bsc#1272167).
    - CVE-2026-59847: integrity downgrade via OpenSSL AES-GCM tag verification (bsc#1272168).
    - CVE-2026-59848: denial of service via SFTP responses with unknown request IDs (bsc#1272169).
    - CVE-2026-59849: denial of service via automatic certificate authentication loop (bsc#1272170).
    - CVE-2026-59850: use-after-free via data callbacks on closed channels (bsc#1272171).

    Changes for libssh:

    - Update to 0.11.5:

     * Zero-initialize every ssh_string
     * Fix compatibility with C23 / gcc16
     * Fix multiple memory leaks, null checks, and error checks
     * Validate peer public key in DH key exchange
     * Avoid remote window overflow
     * Avoid off-by-one overflow during kbdint authentication
     * Avoid logging uninitialized sequence numbers
     * Avoid double conversion of SFTP version number
     * Send correct SFTP server version number
     * Avoid handling repeated SFTP INIT messages
     * Harmonize return values from SFTP server callbacks

    - Update %suse_version checks for SLES 16.x (jsc#PED-15815)

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-2026:3330-1 advisory.

    - CVE-2026-59843: denial of service via zero advertised channel packet size (bsc#1272164).
    - CVE-2026-59844: denial of service via oversized SFTP read length (bsc#1272165).
    - CVE-2026-59845: denial of service via unchecked ProxyCommand fork() failure (bsc#1272166).
    - CVE-2026-59846: information disclosure via ProxyCommand %r username expansion (bsc#1272167).
    - CVE-2026-59847: integrity downgrade via OpenSSL AES-GCM tag verification (bsc#1272168).
    - CVE-2026-59848: denial of service via SFTP responses with unknown request IDs (bsc#1272169).
    - CVE-2026-59850: use-after-free via data callbacks on closed channels (bsc#1272171).

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 SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22956-1 advisory.

    - CVE-2026-15370: stack buffer overflow in SFTP server longname construction (bsc#1272162).
    - CVE-2026-59843: denial of service via zero advertised channel packet size (bsc#1272164).
    - CVE-2026-59844: denial of service via oversized SFTP read length (bsc#1272165).
    - CVE-2026-59845: denial of service via unchecked ProxyCommand fork() failure (bsc#1272166).
    - CVE-2026-59846: information disclosure via ProxyCommand %r username expansion (bsc#1272167).
    - CVE-2026-59847: integrity downgrade via OpenSSL AES-GCM tag verification (bsc#1272168).
    - CVE-2026-59848: denial of service via SFTP responses with unknown request IDs (bsc#1272169).
    - CVE-2026-59849: denial of service via automatic certificate authentication loop (bsc#1272170).
    - CVE-2026-59850: use-after-free via data callbacks on closed channels (bsc#1272171).

    Changes for libssh:

    - Update to 0.11.5:

     * Zero-initialize every ssh_string
     * Fix compatibility with C23 / gcc16
     * Fix multiple memory leaks, null checks, and error checks
     * Validate peer public key in DH key exchange
     * Avoid remote window overflow
     * Avoid off-by-one overflow during kbdint authentication
     * Avoid logging uninitialized sequence numbers
     * Avoid double conversion of SFTP version number
     * Send correct SFTP server version number
     * Avoid handling repeated SFTP INIT messages
     * Harmonize return values from SFTP server callbacks

    - Update %suse_version checks for SLES 16.x (jsc#PED-15815)

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.

ID	Name	Product	Family	Published	Updated	Severity
329159	Fedora 44 : libssh (2026-0e46c91ccf)	Nessus	Fedora Local Security Checks	7/23/2026	7/31/2026	high
329166	Fedora 43 : libssh (2026-063caa9112)	Nessus	Fedora Local Security Checks	7/23/2026	7/31/2026	medium
329559	Linux Distros Unpatched Vulnerability : CVE-2026-59845	Nessus	Misc.	7/25/2026	7/31/2026	medium
328881	Slackware Linux 15.0 / current libssh Multiple Vulnerabilities (SSA:2026-202-01)	Nessus	Slackware Local Security Checks	7/22/2026	7/31/2026	medium
330559	SUSE SLES12 Security Update : libssh (SUSE-SU-2026:3302-1)	Nessus	SuSE Local Security Checks	7/29/2026	7/31/2026	medium
330077	openSUSE 16 Security Update : libssh (openSUSE-SU-2026:21444-1)	Nessus	SuSE Local Security Checks	7/27/2026	7/31/2026	medium
330533	SUSE SLED15 / SLES15 Security Update : libssh (SUSE-SU-2026:3330-1)	Nessus	SuSE Local Security Checks	7/29/2026	7/31/2026	high
330564	SUSE SLES16 Security Update : libssh (SUSE-SU-2026:22956-1)	Nessus	SuSE Local Security Checks	7/29/2026	7/31/2026	high

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