Has anyone seen this issue with libewf?

Hi Guys,
I am using ewfexport to build raw images from E01 files. (Part of the ewf-tools package)
This has worked in the past, but now it is consistently failing, after updating the operating system and libewf.

Both ewfexport and ewfverify continually use memory until they are killed by Ubuntu's OOM.

I have tried going back to old versions of libewf but can not seem to get anything to work. Anyone come across this? Any ideas?

Thanks
Paul