CVE-2026-54353: 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…

PriorityP340high7.1CVSS 3.1

AVNACHPRLUINSCCHILAN

EPSS

0.24%

15.1th percentile

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

2 ranges

Vendor	Product	Version range	Fixed in
budibase	backend-core	>= 0 < 3.39.9	3.39.9
budibase	budibase	< 3.39.9	3.39.9

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