CVE-2026-73410 Budibase: SSRF via DNS rebinding in the REST datasource integration
A builder can exploit DNS rebinding in the REST datasource integration to access internal network resources and bypass validation controls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73410?
CVE-2026-73410 is a high-severity server-side request forgery vulnerability in budibase, published on 17 Aug 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 3.40.0, 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.
Which versions are affected by CVE-2026-73410?
2 open source packages ship an affected version, including @budibase/server.
| Package | Affected | Fixed in |
|---|---|---|
@budibase/server npm | All versions to 3.38.1 | None |
@budibase/server npm | All versions to 3.38.1 | None |
How do I fix CVE-2026-73410?
No fix has been published for CVE-2026-73410 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-73410 being exploited?
There is no known exploitation of CVE-2026-73410 in the wild and no public exploit code.
Sources
Also known as GHSA-v42f-v8xc-j435.