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CVE-2026-73410 is a server-side request forgery vulnerability in Budibase affecting versions prior to 3.40.0. The flaw arises from inconsistent outbound address pinning in the REST datasource integration. In the vulnerable design, one code path validated and pinned a destination address through a Node agent, but the REST integration used an undici dispatcher obtained through a separate fetch utility, causing the HTTP client to resolve the hostname again instead of honoring the previously validated address. This discrepancy allowed a hostname that initially resolved to an allowed public address to later resolve to an internal address during request execution. An authenticated builder could exploit this behavior through DNS rebinding, causing the REST integration to connect to internal network targets after validation had already succeeded. The vulnerable request path permitted arbitrary REST methods and exposed full responses from the reached internal service.
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