Synopsis
The remote Debian host is missing a security-related update.
Description
Multiple security issues were discovered in Python: ElementTree failed to initialise Expat's hash salt, two denial of service issues were found in difflib and poplib and a buffer overflow in PyString_DecodeEscape.
Solution
Upgrade the python3.5 packages.
For the stable distribution (stretch), these problems have been fixed in version 3.5.3-1+deb9u1.