CVE-2026-73410: Budibase

High severity, CVSS 8.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Budibase is an open-source low-code platform. Prior to 3.40.0, packages/backend-core/src/utils/outboundFetch.ts pinned a validated address through a Node agent, but the REST integration used getDispatcher from packages/backend-core/src/utils/fetch.ts, causing undici to ignore that agent and resolve the hostname again. A builder could use DNS rebinding to make packages/server/src/integrations/rest.ts connect to an internal address after a public address passed validation, with full response access and arbitrary REST methods. The fix adds createPinnedLookup support to the undici dispatcher and passes the validated address to custom fetch implementations. This issue is fixed in version 3.40.0.

Affected products

• Budibase Budibase: before 3.40.0 (fixed in 3.40.0)

Published 2026-08-17. Last modified 2026-09-08.