diff --git a/iceoryx2-ffi/cxx/src/unique_port_id.cpp b/iceoryx2-ffi/cxx/src/unique_port_id.cpp
index 25c3041a2..cb354703e 100644
--- a/iceoryx2-ffi/cxx/src/unique_port_id.cpp
+++ b/iceoryx2-ffi/cxx/src/unique_port_id.cpp
@@ -46,7 +46,7 @@ UniquePublisherId::UniquePublisherId(iox2_unique_publisher_id_h handle)
 auto UniquePublisherId::bytes() -> iox::optional<RawIdType>& {
     if (!m_raw_id.has_value() && m_handle != nullptr) {
         RawIdType bytes { UNIQUE_PORT_ID_LENGTH, 0 };
-        iox2_unique_publisher_id_value(m_handle, bytes.data());
+        iox2_unique_publisher_id_value(m_handle, bytes.data(), bytes.size());
         m_raw_id.emplace(std::move(bytes));
     }
     return m_raw_id;
@@ -93,7 +93,7 @@ UniqueSubscriberId::UniqueSubscriberId(iox2_unique_subscriber_id_h handle)
 auto UniqueSubscriberId::bytes() -> iox::optional<RawIdType>& {
     if (!m_raw_id.has_value() && m_handle != nullptr) {
         RawIdType bytes { UNIQUE_PORT_ID_LENGTH, 0 };
-        iox2_unique_subscriber_id_value(m_handle, bytes.data());
+        iox2_unique_subscriber_id_value(m_handle, bytes.data(), bytes.size());
         m_raw_id.emplace(std::move(bytes));
     }
     return m_raw_id;
@@ -139,7 +139,7 @@ UniqueNotifierId::UniqueNotifierId(iox2_unique_notifier_id_h handle)
 auto UniqueNotifierId::bytes() -> iox::optional<RawIdType>& {
     if (!m_raw_id.has_value() && m_handle != nullptr) {
         RawIdType bytes { UNIQUE_PORT_ID_LENGTH, 0 };
-        iox2_unique_notifier_id_value(m_handle, bytes.data());
+        iox2_unique_notifier_id_value(m_handle, bytes.data(), bytes.size());
         m_raw_id.emplace(std::move(bytes));
     }
     return m_raw_id;
@@ -185,7 +185,7 @@ UniqueListenerId::UniqueListenerId(iox2_unique_listener_id_h handle)
 auto UniqueListenerId::bytes() -> iox::optional<RawIdType>& {
     if (!m_raw_id.has_value() && m_handle != nullptr) {
         RawIdType bytes { UNIQUE_PORT_ID_LENGTH, 0 };
-        iox2_unique_listener_id_value(m_handle, bytes.data());
+        iox2_unique_listener_id_value(m_handle, bytes.data(), bytes.size());
         m_raw_id.emplace(std::move(bytes));
     }
     return m_raw_id;
diff --git a/iceoryx2-ffi/ffi/src/api/unique_listener_id.rs b/iceoryx2-ffi/ffi/src/api/unique_listener_id.rs
index 89530262c..d0873d06d 100644
--- a/iceoryx2-ffi/ffi/src/api/unique_listener_id.rs
+++ b/iceoryx2-ffi/ffi/src/api/unique_listener_id.rs
@@ -86,11 +86,26 @@ impl HandleToType for iox2_unique_listener_id_h_ref {
 
 // BEGIN C API
 
+/// Retrieves the value of a unique listener ID.
+///
+/// # Arguments
+///
+/// * `handle` - A valid [`iox2_unique_listener_id_h`]
+/// * `id_ptr` - Pointer to a buffer where the ID value will be written
+/// * `id_length` - The length of the buffer pointed to by `id_ptr`
+///
+/// # Safety
+///
+/// * `handle` must be a valid, non-null pointer
+/// * `id_ptr` must be a valid, non-null pointer to a buffer of at least `id_length` bytes
+/// * `id_length` must be large enough to hold the ID value
 #[no_mangle]
 unsafe extern "C" fn iox2_unique_listener_id_value(
     handle: iox2_unique_listener_id_h,
     id_ptr: *mut u8,
+    id_length: usize,
 ) {
+    debug_assert!(!id_ptr.is_null());
     handle.assert_non_null();
 
     let h = &mut *handle.as_type();
@@ -98,8 +113,10 @@ unsafe extern "C" fn iox2_unique_listener_id_value(
     if let Some(Some(id)) = (h.value.internal.as_ptr() as *const Option<UniqueListenerId>).as_ref()
     {
         let bytes = id.value().to_ne_bytes();
+        debug_assert!(bytes.len() <= id_length, "id_length is too small");
+
         unsafe {
-            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, bytes.len());
+            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, id_length);
         }
     }
 }
diff --git a/iceoryx2-ffi/ffi/src/api/unique_notifier_id.rs b/iceoryx2-ffi/ffi/src/api/unique_notifier_id.rs
index 22e0950e0..f208643f3 100644
--- a/iceoryx2-ffi/ffi/src/api/unique_notifier_id.rs
+++ b/iceoryx2-ffi/ffi/src/api/unique_notifier_id.rs
@@ -86,11 +86,26 @@ impl HandleToType for iox2_unique_notifier_id_h_ref {
 
 // BEGIN C API
 
+/// Retrieves the value of a unique notifier ID.
+///
+/// # Arguments
+///
+/// * `handle` - A valid [`iox2_unique_notifier_id_h`]
+/// * `id_ptr` - Pointer to a buffer where the ID value will be written
+/// * `id_length` - The length of the buffer pointed to by `id_ptr`
+///
+/// # Safety
+///
+/// * `handle` must be a valid, non-null pointer
+/// * `id_ptr` must be a valid, non-null pointer to a buffer of at least `id_length` bytes
+/// * `id_length` must be large enough to hold the ID value
 #[no_mangle]
 unsafe extern "C" fn iox2_unique_notifier_id_value(
     handle: iox2_unique_notifier_id_h,
     id_ptr: *mut u8,
+    id_length: usize,
 ) {
+    debug_assert!(!id_ptr.is_null());
     handle.assert_non_null();
 
     let h = &mut *handle.as_type();
@@ -98,8 +113,10 @@ unsafe extern "C" fn iox2_unique_notifier_id_value(
     if let Some(Some(id)) = (h.value.internal.as_ptr() as *const Option<UniqueNotifierId>).as_ref()
     {
         let bytes = id.value().to_ne_bytes();
+        debug_assert!(bytes.len() <= id_length, "id_length is too small");
+
         unsafe {
-            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, bytes.len());
+            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, id_length);
         }
     }
 }
diff --git a/iceoryx2-ffi/ffi/src/api/unique_publisher_id.rs b/iceoryx2-ffi/ffi/src/api/unique_publisher_id.rs
index 3c1804d95..5b5acb231 100644
--- a/iceoryx2-ffi/ffi/src/api/unique_publisher_id.rs
+++ b/iceoryx2-ffi/ffi/src/api/unique_publisher_id.rs
@@ -86,11 +86,26 @@ impl HandleToType for iox2_unique_publisher_id_h_ref {
 
 // BEGIN C API
 
+/// Retrieves the value of a unique publisher ID.
+///
+/// # Arguments
+///
+/// * `handle` - A valid [`iox2_unique_publisher_id_h`]
+/// * `id_ptr` - Pointer to a buffer where the ID value will be written
+/// * `id_length` - The length of the buffer pointed to by `id_ptr`
+///
+/// # Safety
+///
+/// * `handle` must be a valid, non-null pointer
+/// * `id_ptr` must be a valid, non-null pointer to a buffer of at least `id_length` bytes
+/// * `id_length` must be large enough to hold the ID value
 #[no_mangle]
 unsafe extern "C" fn iox2_unique_publisher_id_value(
     handle: iox2_unique_publisher_id_h,
     id_ptr: *mut u8,
+    id_length: usize,
 ) {
+    debug_assert!(!id_ptr.is_null());
     handle.assert_non_null();
 
     let h = &mut *handle.as_type();
@@ -98,8 +113,10 @@ unsafe extern "C" fn iox2_unique_publisher_id_value(
     if let Some(Some(id)) = (h.value.internal.as_ptr() as *const Option<UniquePublisherId>).as_ref()
     {
         let bytes = id.value().to_ne_bytes();
+        debug_assert!(bytes.len() <= id_length, "id_length is too small");
+
         unsafe {
-            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, bytes.len());
+            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, id_length);
         }
     }
 }
diff --git a/iceoryx2-ffi/ffi/src/api/unique_subscriber_id.rs b/iceoryx2-ffi/ffi/src/api/unique_subscriber_id.rs
index 64487e76c..c6c1fa7b5 100644
--- a/iceoryx2-ffi/ffi/src/api/unique_subscriber_id.rs
+++ b/iceoryx2-ffi/ffi/src/api/unique_subscriber_id.rs
@@ -86,11 +86,26 @@ impl HandleToType for iox2_unique_subscriber_id_h_ref {
 
 // BEGIN C API
 
+/// Retrieves the value of a unique subscriber ID.
+///
+/// # Arguments
+///
+/// * `handle` - A valid [`iox2_unique_subscriber_id_h`]
+/// * `id_ptr` - Pointer to a buffer where the ID value will be written
+/// * `id_length` - The length of the buffer pointed to by `id_ptr`
+///
+/// # Safety
+///
+/// * `handle` must be a valid, non-null pointer
+/// * `id_ptr` must be a valid, non-null pointer to a buffer of at least `id_length` bytes
+/// * `id_length` must be large enough to hold the ID value
 #[no_mangle]
 unsafe extern "C" fn iox2_unique_subscriber_id_value(
     handle: iox2_unique_subscriber_id_h,
     id_ptr: *mut u8,
+    id_length: usize,
 ) {
+    debug_assert!(!id_ptr.is_null());
     handle.assert_non_null();
 
     let h = &mut *handle.as_type();
@@ -99,8 +114,10 @@ unsafe extern "C" fn iox2_unique_subscriber_id_value(
         (h.value.internal.as_ptr() as *const Option<UniqueSubscriberId>).as_ref()
     {
         let bytes = id.value().to_ne_bytes();
+        debug_assert!(bytes.len() <= id_length, "id_length is too small");
+
         unsafe {
-            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, bytes.len());
+            std::ptr::copy_nonoverlapping(bytes.as_ptr(), id_ptr, id_length);
         }
     }
 }