diff --git a/dcmdata/tests/tfrmsiz.cc b/dcmdata/tests/tfrmsiz.cc
index e14fa56db..10b0329f9 100644
--- a/dcmdata/tests/tfrmsiz.cc
+++ b/dcmdata/tests/tfrmsiz.cc
@@ -1,6 +1,6 @@
 /*
  *
- *  Copyright (C) 2024, OFFIS e.V.
+ *  Copyright (C) 2024-2025, OFFIS e.V.
  *  All rights reserved.  See COPYRIGHT file for details.
  *
  *  This software and supporting documentation are maintained by
@@ -130,6 +130,9 @@ OFTEST(dcmdata_uncompressedFrameSize)
             OFCHECK(0 == px->decodedBitsAllocated(13, 8));
             OFCHECK(16 == px->decodedBitsAllocated(16, 8));
             OFCHECK(64 == px->decodedBitsAllocated(64, 8));
+
+            // avoid memory leak
+            DcmRLEDecoderRegistration::cleanup();
         }
     }
 }
diff --git a/dcmect/tests/t_overflow.cc b/dcmect/tests/t_overflow.cc
index 4e07a5c54..fb6ef9c75 100644
--- a/dcmect/tests/t_overflow.cc
+++ b/dcmect/tests/t_overflow.cc
@@ -1,6 +1,6 @@
 /*
  *
- *  Copyright (C) 2024, OFFIS e.V.
+ *  Copyright (C) 2024-2025, OFFIS e.V.
  *  All rights reserved.  See COPYRIGHT file for details.
  *
  *  This software and supporting documentation were developed by
@@ -87,6 +87,7 @@ OFTEST(dcmect_overflow)
     OFCondition result;
     result = ct->saveFile("output.dcm", EXS_LittleEndianExplicit);
     OFCHECK_MSG(result == ECT_InvalidPixelInfo, result.text());
+    delete ct;
 }
 
 static EctEnhancedCT *create()
diff --git a/dcmfg/tests/t_fg_base.cc b/dcmfg/tests/t_fg_base.cc
index 00437a68b..faec81038 100644
--- a/dcmfg/tests/t_fg_base.cc
+++ b/dcmfg/tests/t_fg_base.cc
@@ -1,6 +1,6 @@
 /*
  *
- *  Copyright (C) 2022-2024, OFFIS e.V.
+ *  Copyright (C) 2022-2025, OFFIS e.V.
  *  All rights reserved.  See COPYRIGHT file for details.
  *
  *  This software and supporting documentation were developed by
@@ -46,4 +46,5 @@ OFTEST(dcmfg_fgbase_fgunknown)
     FGUnknown* fg_copy = OFstatic_cast(FGUnknown*, fg.clone());
     OFCHECK(fg_copy != NULL);
     OFCHECK(fg.compare(*fg_copy) == 0);
+    delete fg_copy;
 }
diff --git a/dcmseg/tests/tutils.cc b/dcmseg/tests/tutils.cc
index 37405859f..aefce6677 100644
--- a/dcmseg/tests/tutils.cc
+++ b/dcmseg/tests/tutils.cc
@@ -1,6 +1,6 @@
 /*
  *
- *  Copyright (C) 2015-2024, OFFIS e.V.
+ *  Copyright (C) 2015-2025, OFFIS e.V.
  *  All rights reserved.  See COPYRIGHT file for details.
  *
  *  This software and supporting documentation were developed by
@@ -72,6 +72,7 @@ OFTEST(dcmseg_packBinaryFrame)
     OFCHECK_MSG(packed->pixData[2] == 0b00010000, OFString("Expected 0b00010000, got ") + DcmSegUtils::debugByte2Bin(packed->pixData[2]));
     OFCHECK_MSG(packed->pixData[3] == 0b01000010, OFString("Expected 0b01000010, got ") + DcmSegUtils::debugByte2Bin(packed->pixData[3]));
     OFCHECK_MSG(packed->pixData[4] == 0b00000000, OFString("Expected 0b00000000, got ") + DcmSegUtils::debugByte2Bin(packed->pixData[4]));
+    delete packed;
 
     // In 1000 iterations create sparse frames and pack them. Check whether the
     // packed frame is correct. This is not bullet proof but we use the same addressing
@@ -206,6 +207,10 @@ OFTEST(dcmseg_concatBinaryFrames)
     OFCHECK_MSG(pixData[0] == 0b11111111, OFString("Expected 0b11111111, got ") + DcmSegUtils::debugByte2Bin(pixData[0]));
     OFCHECK_MSG(pixData[1] == 0b11101111, OFString("Expected 0b11101111, got ") + DcmSegUtils::debugByte2Bin(pixData[1]));
     OFCHECK_MSG(pixData[2] == 0b11111111, OFString("Expected 0b11111111, got ") + DcmSegUtils::debugByte2Bin(pixData[2]));
+    // avoid memory leaks
+    delete packed1;
+    delete packed2;
+    delete[] pixData;
 }
 
 // Test DcmSegUtils::debugByte2Bin()