There was no qualification, and all entrants advanced to the final tournament. The following 12 teams from member associations of the ASEAN Football Federation entered the tournament.
The tournament's official draw was held on 6 March 2026 in Jakarta, Indonesia at 14:00 (GMT+07:00). The pot placements followed each teams progress based on the previous edition.
Players born on or after 1 January 2009 are eligible to compete in the tournament. Each team can register a maximum of 23 players (minimum three of whom must be goalkeepers).
Group stage
The group winners and best runners-up advanced to the semi-finals.
Teams were ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss), and if tied on points, the following tie-breaking criteria were applied, in the order given, to determine the rankings:
Goals scored in head-to-head matches among tied teams;
If more than two teams were tied, and after applying all head-to-head criteria above, a subset of teams were still tied, all head-to-head criteria above were reapplied exclusively to this subset of teams;
Goal difference in all group matches;
Goals scored in all group matches;
Penalty shoot-out if only two teams were tied and they met in the last round of the group;
Disciplinary points (yellow card = 1 point, red card as a result of two yellow cards = 3 points, direct red card = 3 points, yellow card followed by direct red card = 4 points);
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