CVE-2026-52858: disable execution of import/from statements harvested from
the buffer during python omni-completion (pythoncomplete/python3complete),
gated behind the opt-in g:pythoncomplete_allow_import (upstream 9.2.0561 and
9.2.0568)
CVE-2026-52860: strip parameter default values and annotations and whitelist
class base expressions before exec() of reconstructed function/class source
in python omni-completion (upstream 9.2.0597)