According to the versions of the libssh2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open()     function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client     opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the     response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error     such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache     dup conditions on glibc systems that allow overlapping allocations and function pointer     overwrites.(CVE-2026-66032)

    libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows     a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an     uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1     response parser reads a server-controlled comment_len value and advances the parse pointer without     verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from     adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup     path frees an uninitialized pointer from a non-zeroed realloc() region.(CVE-2026-66034)

    libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries     before parsing populates them, so a parse failure reaching the cleanup path leaves     libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the     publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-     influenceable attrs pointer in a connecting libssh2 client.(CVE-2026-58051)

    libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem     response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds     checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH     server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer     overflow in a connecting libssh2 client.(CVE-2026-58050)

    libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the     sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to     disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can     supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and     REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the     missing validation of available packet buffer size before the memcpy operation.(CVE-2025-15661)

    libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service     vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause     a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set     nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over     60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not     apply to CPU-bound loops.(CVE-2026-55199)

Tenable has extracted the preceding description block directly from the EulerOS libssh2 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 SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3526-1 advisory.

    - CVE-2025-15661: out-of-bounds heap read vulnerability in the `sftp_symlink()` function in `src/sftp.c`     (bsc#1268546).
    - CVE-2026-7598: integer overflow in function `userauth_password` of file `src/userauth.c` (bsc#1263890).
    - CVE-2026-58050: heap buffer overflow due to missing bounds check in attribute count of publickey-     subsystem response       (bsc#1269568).
    - CVE-2026-58051: uninitialized pointer freed when malformed responses are sent by an SSH server     (bsc#1269567).
    - CVE-2026-66032: arbitrary code execution via double-free in SFTP session (bsc#1272737).
    - CVE-2026-66033: denial of service via integer underflow in AES-GCM cipher negotiation (bsc#1272736).
    - CVE-2026-66034: information disclosure and potential arbitrary code execution via heap out-of-bounds     read       (bsc#1272735).
    - CVE-2026-66035: arbitrary code execution via heap buffer overflow during SSH negotiation (bsc#1272734).

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	名稱	產品	系列	已發布	已更新	嚴重性
364954	EulerOS 2.0 SP11 : libssh2 (EulerOS-SA-2026-4341)	Nessus	Huawei Local Security Checks	2026/10/12	2026/10/12	high
365059	EulerOS 2.0 SP11 : libssh2 (EulerOS-SA-2026-4250)	Nessus	Huawei Local Security Checks	2026/10/12	2026/10/12	high
333544	SUSE SLES15 Security Update : libssh2_org (SUSE-SU-2026:3526-1)	Nessus	SuSE Local Security Checks	2026/8/9	2026/8/9	high

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