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Vulnerability record · CVE-2026-73410 · published 17 August 2026

CVE-2026-73410: TOCTOU race condition vulnerability

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.

8.5 CVSS 3.1 High EPSS 0.28% · top 81.6% CWE-367 · TOCTOU race conditionCWE-918 · Server-side request forgery (SSRF) Deferred
8.5CVSS 3.1 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
8 Sep 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/Budibase/budibase/commit/5758bdb242802ca20c4ed0dc579e4330ee898ef3
https://github.com/Budibase/budibase/security/advisories/GHSA-v42f-v8xc-j435

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Source: NIST National Vulnerability Database (record CVE-2026-73410), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.