Vulnerability in Usebruno Bruno
CVE-2026-34841
Bruno is an open source IDE for exploring and testing APIs. Prior to 3.2.1, Bruno was affected by a supply chain attack involving compromised versions of the axios npm package, which introduced a hidden dependency deploying a cross-platform Remote Access Trojan (RAT). Users of @usebruno/cli who ran npm install between 00:21 UTC and ~03:30 UTC on March 31, 2026 may have been impacted. Upgrade to 3.2.1
EPSS: 0.002 (14.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Usebruno Bruno — versions < 3.2.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Mitigation, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Mitigation, Press/Media Coverage)
Frequently asked questions
- What is CVE-2026-34841?
- CVE-2026-34841 is a critical-severity vulnerability in Usebruno Bruno, classified under Download of Code Without Integrity Check. CVSS score: 9.8/10. Published 2026-04-06.
- How severe is CVE-2026-34841?
- Critical severity. CVSS v3 base score is 9.8 out of 10.