CVE-2026-54353 Budibase: Potential SSRF DNS rebinding bypass in outbound fetch validation
Authenticated users with automation permissions can bypass SSRF protections via DNS rebinding to access internal services and cloud metadata.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54353?
CVE-2026-54353 is a high-severity server-side request forgery vulnerability in budibase, published on 26 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-54353?
2 open source packages ship an affected version, including @budibase/backend-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@budibase/backend-core npm | All versions | 3.39.9 |
@budibase/backend-core npm | All versions | 3.39.9 |
Products include Budibase Budibase.
How do I fix CVE-2026-54353?
Upgrade @budibase/backend-core to 3.39.9 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-54353 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54353 exists.
Other vulnerabilities in budibase
- CVE-2026-54350 Budibase: Anonymous NoSQL operator injection via published-app query templates
- CVE-2026-27702 Budibase Vulnerable to Remote Code Execution via Unsafe eval() in View Filter Map Function (Budibase Cloud)
- CVE-2026-54352 Budibase: Arbitrary file read by workspace-builder via PWA-zip symlink upload
- CVE-2026-31818 Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist
- CVE-2026-30240 Budibase PWA ZIP Upload Path Traversal Allows Reading Arbitrary Server Files Including All Environment Secrets
Sources
Also known as GHSA-gfq7-5x4g-3xhf.