diff -urNp a/IlmImf/ImfRleCompressor.cpp b/IlmImf/ImfRleCompressor.cpp

--- a/IlmImf/ImfRleCompressor.cpp	2020-06-02 12:29:00.823667417 +0200

+++ b/IlmImf/ImfRleCompressor.cpp	2020-06-02 12:32:51.134011377 +0200

@@ -135,6 +135,11 @@ rleUncompress (int inLength, int maxLeng

 	    if (0 > (maxLength -= count))

 		return 0;

+        // check the input buffer is big enough to contain

+        // 'count' bytes of remaining data

+        if (inLength < 0)

+          return 0;

+

 	    while (count-- > 0)

 		*out++ = *(char *) (in++);

 	}