diff --git a/src/cineon.imageio/cineoninput.cpp b/src/cineon.imageio/cineoninput.cpp
index d64ac4ab3d..330ba34c27 100644
--- a/src/cineon.imageio/cineoninput.cpp
+++ b/src/cineon.imageio/cineoninput.cpp
@@ -41,6 +41,7 @@ class CineonInput final : public ImageInput {
             m_stream = nullptr;
         }
         m_userBuf.clear();
+        m_cin.SetInStream(nullptr);
     }
 
     /// Helper function - retrieve string for libcineon descriptor
@@ -89,12 +90,23 @@ CineonInput::open(const std::string& name, ImageSpec& newspec)
         return false;
     }
 
+    int nchannels = m_cin.header.NumberOfElements();
+    if (nchannels < 1 || nchannels > 8) {
+        errorfmt("Invalid number of channels {} (must be 1-8)", nchannels);
+        close();
+        return false;
+    }
+
     // create imagespec
     TypeDesc typedesc;
     int maxbits = 0;
-    for (int i = 0; i < m_cin.header.NumberOfElements(); i++) {
-        if (maxbits < m_cin.header.BitDepth(i))
-            maxbits = m_cin.header.BitDepth(i);
+    for (int i = 0; i < nchannels; i++) {
+        int b(m_cin.header.BitDepth(i));
+        if (b < 1 || b > 32) {
+            errorfmt("Invalid bitdepth in channel {}: {} bits", i, b);
+            return false;
+        }
+        maxbits = std::max(maxbits, b);
     }
     switch ((maxbits + 7) / 8) {
     case 1: typedesc = TypeDesc::UINT8; break;
@@ -103,8 +115,13 @@ CineonInput::open(const std::string& name, ImageSpec& newspec)
     case 4: typedesc = TypeDesc::UINT32; break;
     default: errorfmt("Unsupported bit depth {}", maxbits); return false;
     }
-    m_spec = ImageSpec(m_cin.header.Width(), m_cin.header.Height(),
-                       m_cin.header.NumberOfElements(), typedesc);
+    m_spec = ImageSpec(m_cin.header.Width(), m_cin.header.Height(), nchannels,
+                       typedesc);
+
+    if (!check_open(m_spec, { 0, 1 << 20, 0, 1 << 20, 0, 1, 0, 8 })) {
+        return false;
+    }
+
     // fill channel names
     m_spec.channelnames.clear();
     int gscount = 0, rcount = 0, gcount = 0, bcount = 0;
@@ -119,7 +136,7 @@ CineonInput::open(const std::string& name, ImageSpec& newspec)
             break;
         case cineon::kPrintingDensityRed:
         case cineon::kRec709Red:
-            if (++gscount > 1) {
+            if (++rcount > 1) {
                 std::string ch = Strutil::fmt::format("R{}", rcount);
                 m_spec.channelnames.push_back(ch);
             } else
diff --git a/testsuite/cineon/ref/out.txt b/testsuite/cineon/ref/out.txt
index efe69e19aa..74ad31e404 100644
--- a/testsuite/cineon/ref/out.txt
+++ b/testsuite/cineon/ref/out.txt
@@ -33,3 +33,6 @@ Reading ../oiio-images/cineon/checker.cin
     cineon:YOffset: 0
     oiio:BitsPerSample: 10
     oiio:ColorSpace: "KodakLog"
+oiiotool ERROR: read : "src/broken_bitdepth.cin": Invalid number of channels 255 (must be 1-8)
+Full command line was:
+> oiiotool --info --hash src/broken_bitdepth.cin
diff --git a/testsuite/cineon/run.py b/testsuite/cineon/run.py
index 9637ef88a9..e73803c963 100755
--- a/testsuite/cineon/run.py
+++ b/testsuite/cineon/run.py
@@ -4,7 +4,15 @@
 # SPDX-License-Identifier: Apache-2.0
 # https://github.com/AcademySoftwareFoundation/OpenImageIO
 
+# save the error output
+redirect = " >> out.txt 2>&1 "
 
 files = [ "checker.cin" ]
 for f in files:
     command += info_command ("../oiio-images/cineon/" + f)
+
+
+# Regression tests for broken files
+command += info_command ("src/broken_bitdepth.cin", verbose=False, failureok=True)
+
+outputs = [ "out.txt" ]
diff --git a/testsuite/cineon/src/broken_bitdepth.cin b/testsuite/cineon/src/broken_bitdepth.cin
new file mode 100644
index 0000000000..f239e66fe3
Binary files /dev/null and b/testsuite/cineon/src/broken_bitdepth.cin differ