Budibase: SSRF via DNS rebinding in the REST datasource integration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73410
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-17 21:16:48 UTC
Updated2026-08-17 22:17:26 UTC
DescriptionBudibase 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.

Risk And Classification

Primary CVSS: v3.1 8.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-367 | CWE-918 | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Budibase Budibase affected < 3.40.0 Not specified

References

ReferenceSourceLinkTags
github.com/Budibase/budibase/security/advisories/GHSA-v42f-v8xc-j435 [email protected] github.com
github.com/Budibase/budibase/commit/5758bdb242802ca20c4ed0dc579e4330ee89... [email protected] github.com
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