Description
Bruno versions through 4.1.0 fail to validate file paths in request body declarations, allowing attackers to read arbitrary local files by using parent-directory traversal segments. When a collection is executed, attackers can craft a request with a body:file path containing ../ sequences that resolve outside the collection directory, causing the application to read and exfiltrate arbitrary files to attacker-controlled endpoints.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| usebruno | bruno | ≤ 4.1.0 | — |
Advisories 1
- WID-SEC-2026-3197 Bruno: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Sep 8, 2026
References
- GitHub Issue #8230 issue-tracking
- https://github.com/usebruno/bruno product
- https://github.com/usebruno/bruno/blob/v4.1.0/packages/bruno-cli/src/runner/prepare-request.js technical-description
- VulnCheck Advisory: Bruno 3.4.2 Arbitrary File Read via Unconfined Body File Path third-party-advisory