PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.58, spider_tools._host_is_blocked() does not resolve ordinary hostnames before scrape_page fetches them. A hostname such as 127.0.0.1.nip.io passes validation and resolves to loopback, permitting internal HTTP access. The fix uses socket.getaddrinfo and fails closed on DNS errors. This issue is fixed in version 1.6.58.

CVE-2026-55526 affects PraisonAI's multi-agent system (praisonaiagents) prior to version 1.6.58. The vulnerability exists in spider_tools._host_is_blocked(), which fails to resolve hostnames before scrape_page fetches them. An attacker can craft a hostname like 127.0.0.1.nip.io that passes the blocklist validation but resolves to a loopback address, enabling Server-Side Request Forgery (SSRF) to access internal HTTP services. This is a classic DNS rebinding/SSRF bypass technique. The fix was implemented in version 1.6.58 by using socket.getaddrinfo to resolve hostnames prior to validation and failing closed on DNS errors. Users should upgrade to praisonaiagents 1.6.58 or later immediately to remediate the issue.