CVE-2026-73410 Budibase CVE debrief

Who should care

Defenders responsible for Budibase deployments should assess exposure and prioritize updating to version 3.40.0 or later to prevent potential DNS rebinding attacks. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify Budibase versions and implement necessary controls.

Why it matters

Defenders should care about CVE-2026-73410 because it allows a builder to use DNS rebinding to make the REST integration connect to an internal address, potentially leading to unauthorized access and data breaches. Budibase deployments should assess exposure and prioritize updating to version 3.40.0 or later.

• Potential unauthorized access to internal addresses
• Possible data breaches through REST integration
• Need for verification of Budibase version and update to 3.40.0 or later
• Importance of monitoring for suspicious DNS rebinding activity

Technical summary

Budibase, an open-source low-code platform, had a vulnerability prior to version 3.40.0 that allowed a builder to use DNS rebinding to make the REST integration connect to an internal address after a public address passed validation. The fix adds createPinnedLookup support to the undici dispatcher and passes the validated address to custom fetch implementations. This change prevents unauthorized access to internal addresses and potential data breaches through REST integration. Defenders should prioritize verifying Budibase versions and updating to 3.40.0 or later.

Defensive priority

Defenders should prioritize verifying Budibase versions and updating to 3.40.0 or later to prevent potential DNS rebinding attacks.

Recommended defensive actions

• Verify Budibase version and update to 3.40.0 or later
• Review and restrict REST integration access controls
• Monitor for suspicious DNS rebinding activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and affected versions. The vulnerability was publicly disclosed on 2026-08-17T21:16:48.823Z. The fix adds createPinnedLookup support to the undici dispatcher and passes the validated address to custom fetch implementations. Evidence limits suggest verifying Budibase versions and updating to 3.40.0 or later.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.