Vulnerability · Published Jun 26, 2026 · Assigned by GitHub_M
CVE-2026-54353Budibase: Potential SSRF DNS rebinding bypass in outbound fetch validation
High 8.5
In plain English
A high-severity server-side request forgery in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @budibase/backend-core | 3.39.9 | GHSA-gfq7-5x4g-3xhf |
Affected products (as reported)
Weakness: CWE-367, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
References
- https://github.com/Budibase/budibase/security/advisories/GHSA-gfq7-5x4g-3xhf x_refsource_CONFIRM