There is an invalid memory access in the function TextString::~TextString() located in Catalog.cc in Xpdf 4.0.2. It can be triggered by (for example) sending a crafted pdf file to the pdftohtml binary, which allows a remote attacker to cause a Denial of Service (Segmentation fault) or possibly have unspecified other impact.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24996
Reference (s):
- https://forum.xpdfreader.com/viewtopic.php?f=3&t=42028