CVE-2026-34841: Usebruno Bruno

Critical severity, CVSS 9.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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

Affected products

• Usebruno Bruno: before 3.2.1 (fixed in 3.2.1)

Published 2026-04-06. Last modified 2026-06-17.