Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-84CE26C3-5769-11E9-ABD6-001B217B3468:
Clamav reports:
An out-of-bounds heap read condition may occur when scanning PDF documents
An out-of-bounds heap read condition may occur when scanning PE files
An out-of-bounds heap write condition may occur when scanning OLE2 files
An out-of-bounds heap read condition may occur when scanning malformed PDF documents
A path-traversal write condition may occur as a result of improper input validation when scanning RAR archives
A use-after-free condition may occur as a result of improper error handling when scanning nested RAR archives
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