Plug: quadratic-time decoding of nested query/body parameters enables denial of service

Summary Plug's nested-parameter decoder Plug.Conn.Query parses URL-encoded keys in time quadratic in their bracket-nesting depth. Any unauthenticated remote attacker that can reach a Plug-based HTTP endpoint can pin a BEAM scheduler for minutes with a single small request. Details For a key like...

CLSA-2022-1669237735 python2: Fix of CVE-2022-45061

CVE-2022-45061: Fix quadratic time idna decoding - fix tests to be compatible with expat 2.2.5...