Path Traversal in Usebruno Bruno
CVE-2026-85665
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.008 (54.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/usebruno/bruno (product)
- github.com/usebruno/bruno/blob/v4.1.0/packages/bruno-cli/src/runner/prepare-req… (technical-description)
- github.com/usebruno/bruno/issues/8230 (issue-tracking)
- www.vulncheck.com/advisories/bruno-3.4.2-arbitrary-file-read-via-unconfined-bod… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85665?
- CVE-2026-85665 is a medium-severity vulnerability in Usebruno Bruno, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-09-04.
- How severe is CVE-2026-85665?
- Medium severity. CVSS v3 base score is 6.5 out of 10.