fix: CVE-2025-15661 and CVE-2026-55199 for libssh2#3
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Fix heap buffer over-read in sftp_symlink() by using the string_buf struct to guard against out-of-bounds reads and malformed packets. Upstream: libssh2/libssh2@2dae302 Generated-By: uos/deepseek-v4-flash Co-Authored-By: hudeng <hudeng@deepin.org>
Fix pre-authentication DoS by checking return values from _libssh2_get_string() in the SSH_MSG_EXT_INFO handler. Upstream: libssh2/libssh2@1762685 Generated-By: uos/deepseek-v4-flash Co-Authored-By: hudeng <hudeng@deepin.org>
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Fix two CVEs in libssh2:
CVE-2025-15661
Heap buffer over-read in sftp_symlink() via crafted SSH_FXP_NAME response.
Upstream: 2dae3024897e1898d389835151f4e9606227721d
CVE-2026-55199
Pre-authentication DoS via SSH_MSG_EXT_INFO handler causing CPU exhaustion.
Upstream: 17626857d20b3c9a1addfa45979dadcee1cd84a4