budibase up to 3.39.8 /api/pwa/process-zip createReadStream path traversal

Summaryinfo

A vulnerability described as critical has been identified in budibase up to 3.39.8. This affects the function createReadStream of the file /api/pwa/process-zip. The manipulation results in path traversal. This vulnerability is reported as CVE-2026-54352. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in budibase up to 3.39.8. It has been classified as critical. Affected is the function createReadStream of the file /api/pwa/process-zip. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Budibase is an open-source low-code platform. Prior to 3.39.9, `POST /api/pwa/process-zip` at packages/server/src/api/routes/static.ts:24 accepts a builder-uploaded .zip, extracts it with [email protected] into a temp directory, then for each entry listed in icons.json validates the icon path, opens it, and streams the bytes into MinIO. The resulting object is served back via GET /api/assets/{appId}/pwa/{uuid}.png. [email protected] preserves absolute symlink targets when restoring symlink entries. The icon-source validator at packages/server/src/api/controllers/static/index.ts:259-268 resolves the icon source string against baseDir (path.resolve), checks resolvedSrc.startsWith(baseDir + path.sep) against that string, and calls fs.existsSync(resolvedSrc) which follows symbolic links to confirm the target exists. None of the three calls reject symbolic-link entries. packages/backend-core/src/objectStore/objectStore.ts:302 then calls (await fsp.open(path)).createReadStream() on the resolved path. fsp.open follows the symlink, the target file's bytes stream into MinIO, and the response of the asset-fetch endpoint returns those bytes verbatim. Result: a workspace-level builder reads any file the server process can open. This vulnerability is fixed in 3.39.9.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-54352 since 06/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 3.39.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-39910). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• budibase

Version

• 3.39.0
• 3.39.1
• 3.39.2
• 3.39.3
• 3.39.4
• 3.39.5
• 3.39.6
• 3.39.7
• 3.39.8

Website

• Product: https://github.com/Budibase/budibase/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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