CVE-2026-54353: Budibase

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Budibase is an open-source low-code platform. Prior to 3.39.9, authenticated users with automation permissions can bypass Budibase's SSRF blacklist through DNS rebinding. The outbound fetch flow validates a hostname against the blacklist before the request is sent, but the actual socket connection later performs a separate DNS lookup through node-fetch. Since the validated IPs are never pinned to the connection, an attacker-controlled hostname can return a public IP during validation and a private/internal IP during the real connection. This results in a non-blind SSRF primitive against internal services reachable from the Budibase host, including loopback, RFC1918 ranges, and cloud metadata endpoints. This vulnerability is fixed in 3.39.9.

Affected products

• Budibase Budibase: before 3.39.9 (fixed in 3.39.9)

Published 2026-06-26. Last modified 2026-06-30.