The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_62217 advisory.

    * libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)

    * libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)

    * libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)

    * libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)

    * libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)

    * libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)

    * libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)

Tenable has extracted the preceding description block directly from the CIQ 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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-622170 advisory.

    [0.10.4-19]
    - Backport CVE patches from 0.11.5       Resolves: RHEL-213033       Resolves: RHEL-213041       Resolves: RHEL-213047       Resolves: RHEL-213081       Resolves: RHEL-213114       Resolves: RHEL-213119       Resolves: RHEL-213151

Tenable has extracted the preceding description block directly from the Oracle Linux 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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:55855 advisory.

    * libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)

    * libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)

    * libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)

    * libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)

    * libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)

    * libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)

    * libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)

    * libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)

    * libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)

    * libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)

    * libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)

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

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

According to the versions of the libssh packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in     SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial     of service.(CVE-2026-59843)

    A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can     effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire     without detection.(CVE-2026-59847)

    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)

    A flaw was found in libssh. If data packets are processed after a channel is closed, channel data     callbacks can be invoked after the associated data has already been freed, leading to crashes or possible     use-after-free conditions.(CVE-2026-59850)

    A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an     arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially     exhaust it through repeated requests.(CVE-2026-59844)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
353891	Rocky Linux 9 [CIQ] Security Update: libssh / libssh-config / libssh-debuginfo / libssh-debugsource / etc Multiple Vulnerabilities (crlsa-2026_62217)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	high
343487	Oracle Linux 9 : ELSA-2026-62217-0: / libssh (ELSA-2026-622170)	Nessus	Oracle Linux Local Security Checks	2026/9/7	2026/9/7	high
337638	RockyLinux 10 : libssh (RLSA-2026:55855)	Nessus	Rocky Linux Local Security Checks	2026/8/18	2026/8/18	high
364969	EulerOS 2.0 SP11 : libssh (EulerOS-SA-2026-4340)	Nessus	Huawei Local Security Checks	2026/10/12	2026/10/12	high

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