CVE-2026-55536: Mervinpraison Praisonai

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, Browser Server _handle_connection() checks Chrome extension origins with re.match() and the unanchored expression chrome-extension://[a-z0-9]{32}. Extra trailing characters pass before websocket.accept(), allowing start_session commands and unauthorized browser automation. This issue is fixed in version 4.6.58.

Affected products

• Mervinpraison Praisonai: before 4.6.58 (fixed in 4.6.58)

Published 2026-08-25. Last modified 2026-09-09.