CVE-2026-54353

Description

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.

Severity (CVSS)

Weaknesses

• CWE-367 — CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
• CWE-918 — CWE-918: Server-Side Request Forgery (SSRF)

Affected products

References

• https://github.com/Budibase/budibase/security/advisories/GHSA-gfq7-5x4g-3xhf (x_refsource_CONFIRM)