What’s Vulnerable › Vulnerabilities

CVE-2026-54353: Budibase: Potential SSRF DNS rebinding bypass in outbound fetch validation

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-26 · updated 2026-06-30
• Weakness: CWE-367

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 products

• budibase: before 3.39.9 — fixed in 3.39.9

How to fix

Upgrade to a fixed version: budibase 3.39.9. Check the vendor advisory for mitigations.

References

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

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