Is a 1-hour layover enough at CDG?

The honest answer: it depends on four things

One hour is enough for some real combinations and nowhere near enough for others. Here is the decision list:

• Terminal pair. 2E–2F inside the secure area can be a 25–50 minute walk (it depends on the hall) — an hour is tight to impossible. A connection within one hall, or within 2A–2D, takes far less time.
• Direction. Crossing the Schengen border adds entry or exit passport control with unpredictable queues. Schengen → Schengen adds none.
• Tickets. One booking means the airline bears some risk. Separate tickets mean a delay can cost you your unprotected second flight.
• Baggage. If you must reclaim and re-check (separate tickets, not through-checked), one hour is effectively gone before you start.

When 60 minutes can work

• Same terminal or an easy pair inside the secure area (for example within 2E–2F when your arrival hall is favorable).
• Schengen → Schengen on one booking: no border control, usually no second security check.
• Hand baggage only, already checked in for the second flight.
• First flight lands on time — the part nobody can promise.

When 60 minutes is a bad idea

• Any connection requiring CDGVAL or a landside terminal change.
• Entering the Schengen Area at a busy arrival time (mid-morning, mid-afternoon).
• Non-Schengen → Non-Schengen where you must collect baggage: that is entering France, with border control and re-check-in.
• 2G involved: the shuttle inside the secure area alone takes 15 minutes before you add walking and the gate closing time.

What to do if you already booked a one-hour layover

• Check whether it is one booking or two — the protection difference matters most.
• Look up your terminal pair on this site and read the typical movement range.
• Carry as little hand baggage as you can, and know your arrival hall (2E K/L/M matters a lot).
• Know what to do if you miss your next flight: the later flight options, and whether your ticket type protects you on them.